C.

Cabæus, Nicolaus, 349; criticises
Gilbert, 350; discovers elec. re-
pulsion, 351; elec. theory, 351;
on Garzoni's discoveries, 229; on
mag. spectrum, 352; on mag. tele-
graph, 385; theory compared with
that of Boyle, 419.

Cabiri, 23, 25.
Calamitico, el, 204.
Cambridge Univ'y in time of Gil-
bert, 261.

Canal, Necho's failure to build, 58.
Cardan, Jerome, 243; differentiation

of amber and magnet, 249; Gil-
bert's attitude toward, 280; on
lightning, 568.

Cardinal points, Chinese and Chal-

dean names similar, 63; Etruscan
inv'n of, 59; named by Charle-
magne, 133; named by Flemish
sailors, 133.

Cart, Chinese south-pointing, 67, 69,
71, 72, 73, 81.

Casciorolus discovers Bologna stone,

599

Chaucer on compass points, 191.
China, amber in ancient, 74; burn-
ing of books in, 66; first ships
built in, 78; first south pointing
chariots in, 67; iron in ancient,
73; magnetic rocks on coasts of,
98; nucleus of, 64; original set-
tlers of, 63; pagodas in, 561;
Phoenician voyages to, 77; south-
pointing carts, lost art in, 71;
Tchou dynasty in, 68; voyages to,
in 675 B. C., 56.

Chinese, ancient navigation of, 77;
astronomy, 79; characteristics, 77,
81, 82; chronology, 65; connec-
tion with Akkadians and Baby-
lonians, 63; discover compass
variation, 76; first knowledge of
amber, 74; same of lodestone, 72;
geomancers, 76; junks, 77, 78;
inventions, So; legend of ambas-
sadors, 67; mariner's compass, 75,
76, 85, 189; south-pointing char-
iots, 67, 69, 71; superstitions about
compass, 105; voyages to Japan,
etc., 78; worship of magnet, 80.
Cherif-Edrisi, 100.
Chow, King of, 70.
Chronology, Chinese, 65-67.
Circuit, first elec., 525; Lemonnier's
water and metal, 532; Watson's,
across the Thames, 549.
Claudian, poem on magnet, 93; par-
odied by Strada, 383.

Clayton, letter to Boyle, 425.
Clement of Alexandria, 45.
Clutcher, name for amber, 17.
Clycas, 45.

Coition, magnetic, 276.
Colchester, 260.

Colden, Cadwallader, 585.
College, The Invisible, 379.
Collegium

Naturale Curiosorum,

490.
Collinson, Peter, 538, 583.
Colonne, poem of Guido, 156.
Columbus, Christopher, 195; mag-
netic discoveries of, 200, 202; the-
ory of compass, 199.
Combustion, cases of spontaneous,
503.

Compass, Mariner's, alleged use in
building Great Pyramid, 57; An-
cient Finn, 141; Appulus on, 117;
Arab, 110; attributed to Egyptians,
57; to ancient Greeks, 54; to King
Solomon, 55; to Phoenicians, 54;

Compass (continued.)

to various ancient people, 53; Azi-
muth, 181; boxing the, 187; Chin-
ese, first marine, 189; Chinese
obs'n of variation of, 76; Colum-
bus' alteration of, 196; Columbus'
disc'y of variation of, 200; Colum-
bus' theory of, 199; derivation of
word, 133; design of card, Etrus-
can, 60; De Vitry on, 154; dip or
inclination of, 210; disc'y of dip
of, 209; early Spanish, III; errors
in Columbus', 201; evolution of,
131; Finn, 140; first des'n of, 128;
garlic effect on, supposed, 143;
Gilbert on storage in meridian, 313;
Gilbert's electroscope resembles,
304; governed by earth's poles,
277; Guyot de Provins on, 153; in
time of Peregrinus 179; Lully on,
191; Neckam's des'n of, 128; non-
mag. metal in, 183; Norman's
disc'y of dip, 2:5; Norse penalty
for falsifying, 144; not Chinese
inv'n, 85; not derived by Arabs
from Chinese, 105; old mode of
using, 130; Peregrinus', 180; Porta
on protecting needle of, 238; pun
ishment for tampering with, 144;
secular variation of, 446; sugges-
tion of telegraphy by, 239; tele-
graph, Schwenter's and others',
382; unknown to Saracens, 109;
variation of, 196; William the
Clerk's poem on, 150; Wisbuy
origin of, 146.

Condenser, Franklin's plate, 556.
Conduction, electric discovered by
Guericke, 399; magnetic, Gilbert
on, 289.
Conductor, Desaguiliers proposes
name, 488; magnetic, first sug-
gestion of, 47; prime, inv'd by
Bose, 496; or non-electric, 482.
Constantine, law of, concerning

lightning, 566.

Convection, electrical, 545.
Copernican theory, 267.
Copernicus, Nicolas, 267.

Corffier shocked by lightning, 588.
Corrichterus, his mag. unguent, 37.
Corybantes, 23.

Cowley, poem on R. Society, 413.
Creagus, 159.

Creation, prehistoric account of, 164.
Crows, as guides at sea, 113.
Ctesias, suggestion of lightning pro-
tection, 565.

Cunaeus, inv'n of Leyden jar as-
cribed to, 521.
Curetes, 23.

Current, first suggestion of mag-
netic, 47.

D.

Dactyls, Idean, 22.
Dalance, treatise on magnet, 448.
D'Alibard translates Franklin's pa-
pers, 587; exp'ts on lightning-
rod, 588.

Dantzic, philosophers, exp'ts of,
514; physical society of, 513.
De Augmentis, criticisms of Gilbert
in Bacon's, 328.
De Beauvais.—See Beauvais.
De Bercy.- See Bercy.
De Boodt.-See Boodt.
De Buffon.-See Buffon.
De Fantis.-See Fantis.
De la Hire.-See La Hire.
De Lor.-See Lor.
De Magnete, Bacon's "remains"
taken from Gilbert's, 325.
De Monmor.-See Monmor.
De Natura Rerum, Lucretius' poem,
47; Neckam's treatise, 123.
Denmark, Iron Age in, 21.
D'Epinois, Gautier, poem of, 156.
Desaguiliers, Dr. Joseph, 470; exp'ts
of, 488; on atmospheric elec'y,
489.

Descartes, René, 356; copied by
Digby, 378; magnetic theory, 359;
mag. theory compared with that
of Plutarch, 51; method compared
with that of Bacon, 356; on elec-
trics, 364; on mag. spectrum, 362;
theory abandoned in France, 510;
theory compared with that of Lu-
cretius, 48; vortex theory of, 357.
De Subtilitate, Cardan's work, 246.
Diamond, alleged attraction of, by

iron, 281; alleged magnetism of,
238; alleged screening effect, 88.
Diaz, Bartholomew, voyage of, 205.
Digby, Sir Kenelm, 376; elec. the-
ories of, 378; replies to Browne,
380.

Digges, Madam, her sparkling frock,
425.

Digges, Sir Dudley, 339.

Digges, William, letter concerning
Mrs. Sewall, 425.
Diocles, 41.

Diogenes Laertius, 34.
Dionysius, 59.

Dioscorides on magnet, 92;
ligurius, 42.
Dioscuri, the, 23.

on

Dip of magnetic needle, 209, 210;
Affaitatus' supposed disc'y of,
211; Gilbert on, 213; Hartmann's
disc'y of, 209; Norman's disc'y
of, 215, 217.
Drebbel, Cornelius Van, 44, 192.
Dufay, Charles François, 478; broad
view of elec'y, 487; discovers vit-
reous and resinous elec'y, 484;
electrifies himself, 483; electrifies
metals, 479; exp'ts on colored
objects, 481; on distribution of
charge, 483; no distinction be-
tween electrics and non-electrics,
479; sends letter to R. Society,
485; recognition of Gray's work,
485; tribute to Gray, 487; uses
solid insulators, 482; verifies
Gray's exp'ts on conduction, 479.
Du Tour on Nollet's theory, 554.

E.

Earth, field of force of, Gilbert on,

292; magnetism induced by, 227;
return circuit disc'd by Watson,
550.

Eclipse at time of. Thales, 34.
Effluvium, electric, Cabæus on, 351;
Gilbert on, 308; magnetic, 292.
Egypt, absence of Science in an-
cient, 31; iron in, 28, 58; lack of
amber in ancient, 52; mag. sus
pension in, 45; opening of, to
commerce, 30; religion of ancient,
31; vending machines in ancient,
87.
Egyptians, ancient, ignorance of
magnet of, 27; alleged knowledge
of compass by, 57; voyages of, 58.
Electorius, 42.

Electrical, first use of word, 339.
Electric and magnetic motion com-
pared, 311; attraction, theories of,
307; attraction, Gilbert on, 308;
bell, inv'd by Gordon, 506; light,
see Light, electric; Machine, Gor-
don's, 506; Hauksbee's, 461;
Guericke's, 395; Winkler's, 506;
Motor, Gordon's, 507.
Electricity and lightning, Frank-
lin's exp'ts on identity of, 580, et
seq.; Freke on identity of, 571;
Nollet on identity of, 573; Wink-
ler on identity of, 572; and mag-
netism linked by Newton with

бог

gravity, 439; atmospheric, De-
saguiliers theory of, 489; Frank-
lin's theory of, 576; beginning of
modern, 299; Boyle on mech'l
production of, 418; Digby on,
378; dual nature of, found by
Dufay, 484; and by Kinnersley,
586.

First application to medicine,
501-2; first attempt to measure,
523; first book on, in English,
420; first distinguished from mag-
netism by St. Augustine, 89; first
notice of, by R. Society, 402; first
use of word, 373.

Gordon kills animals by, 507;
Franklin's theory of, 643; Ger-
mans regard as fire, 492; Greene's
poetical references to, 369; Hau-
sen's theory of, 494; Jonson's ref-
erence to, 368; new theories of, in
1747, 553; Quelmalz, theory of,
503; resinous and vitreous, dis-
covered by Dufay, 484; s'Grave-
sande's definition of, 488; speed
of, Lemonnier's attempt to meas-
ure, 532; Watson's attempt, 551;
Winkler's attempt, 506; Watson's
theories of, 507, 534.

Electrics, and non-electrics, Dufay
on, 479; Bacon on, 325; become
non-conductors, 482; Boyle's ad-
ditions to, list of, 419; Boyle ob-
serves mutual attraction of elec-
tric and rubber, 418; Browne's
exp'ts on, 381; Cabaeus' additions
to list of, 350; Descartes on, 364;
Gassendi on attraction of, 418; Gil-
bert's list of, 299; Gilbert on
nature of, 307; mutual attraction
of, obs'd by Acad. del Cimento,
433; naming of, 302; per se, 488.
Electrida, 17.
Electrides, 16, 17.
Electro-magnetism, word coined
by Kircher, 365.
Electrometer, first use of word, 524.
Electron, 16.

Electrum, in Egypt, 52; lake, 17.
Elicott, John, elec. theory of, 554.
Elizabeth, Queen, learning in time
of, 332-334; legacy to Gilbert 265.
Emerson, R. W., on genius, 426.
Emperor First, Chinese, 66.
England in time of Elizabeth, 334;
in time of Hauksbee, 463.
Ephesus, mag. suspension in temple
of, 46.

Field of force, Descartes on, 359;
development of, 218; Dufay on,
483; Gilbert on, 272, 291; iron fil-
ings in, 50; Lucretius on, 48;
magnetic and electric, 434; Max-
well on, 440; Newton on, 440;
Peregrinus on, 172, 207; Porta on,
235; Sarpi on, 227.
Figure-head, inv'n of the, 59.
Finland, conquest of, 137.
Finns, the, 59, 83; and Lapps, 139;
magic of, 138; superstitions con-
cerning, 139; use of compass by,
139.

Finno-Ugric family, 59.
Fire, ancient records of atmos-
pheric, 568; electrical, 509; Ger-
inans regard elec'y as, 492.
Flesh magnet, the, 159.
Fludd, Dr. Robert, 375.
Fluid theory of elec'y, Franklin's,
544.

Form, Aristotelian, 276, 282, 419.
Fountain, Desaguiliers' electrified,
489.
Fracastorio, Jerome, amber theory
of, 241; Gilbert's attitude toward,
280; on mag. rocks, 204.

France, condition of phys. science
in, in 17th cent'y, 452; Franklin's
exp'ts repeated in, 587; learned
societies in, 378.

Franklin, Benjamin, 537; advises
Collinson of discharging effect
of points, 541; correspondence
with Colden, Bowdoin and Belch-
er, 585; electrical exp'ts on Ley-
den jar, etc., 543, 544, 545, 556,
558; on identity of lightning and
elec'y, 580; on points, 541; on
suspended scale pan, 582; experi-
ments repeated in France, 587;
invents plate condenser and series
battery, 556; kite experiment, 590;
lightning rod, 582; papers rejected
by R. Society and published by
Cave, 583; regards lightning as
fired sulphur, 575; retires to de-
vote himself to elec'y, 547; the-
ories of elec'y, 543, 576; theory
claimed by Watson, 552; uses
battery for curative purposes, 585.
Fra Paolo, 224.

Frederick I. of Prussia founds Ber-
lin Society, 490.

Freke on identity of lightning and
elec'y, 571.

Froude, on genius, 426.

G.

Gagates, the, 43, 126.
Galen on amber, 52; on lodestone,

92.

Galileo, abjuration of, 355; con-
demnation of, 356; correspond-
ence with Duke of Tuscany, 345;
experiments on magnet, 345: on
Gilbert's discoveries, 344-345; on
magnetic teleg'h, 385.

Garlic, alleged effect on compass,
143; Matthiolus on, 281.
Garzoni, alleged mag. discoveries
of, 229.

Gassendi, elec. theory of, 418.
Geomancers, Chinese, 75.
Germany, physical science in, 490,

492.

Gibbon on Mahomet's coffin, 46.
Gilbert, William, 258; amber at-
traction of water, 310; amber
questions, 295; and Aristotle, 270,
275; and Barlowe, 340; and Guer-
icke, their mag. theories com-
pared, 393; and Kouopho, 311;
attitude to predecessors, 279; au-
thorities quoted by, 280.

Gilbert (continued.)

Compared by Bacon to Xeno-
phanes, 328; comparison of the
poles, 277; conception of gravity,
437; condemns mag. fallacies,
281; continued as court physician
by James I., 315; copied by Van
Helmont, 373; correlation of elec.
with other motions, 309; correla-
tion of gravity and magnetism,
293; cosmical philosophy, 269;
cosmical system, 294; cosmical
theory accepted by Kepler, 354;
cosmical theory compared with
Newton's, 435, 438; criticised by
Bacon, 321-322-327; death and
burial place, 315; declares earth
a magnet, 276; De Magnete, his
treatise, 260; De Magnete rec'd
in Italy, 343; De Mundo Novo,
his treatise, 260, 316, 318; dis-
coveries recapitulated, 312-313.

Education of, 259; elec. effect
of atmospheric conditions noted,
305; elec. and mag. motions com-
pared, 311; electroscope, 303; em-
bellishments in De Magnete, 268;
errors as to variation, 273; fail-
ures in observation, 312; field of
force discussed, 272, 291; form
and matter theory, 276; free phil-
osophizing of, 310; generation of
lodestone, 287; inductive method
of, prior to Bacon, 330; influence
of Aristotle on, 282; insulation,
308-310; list of electrics, 299; list
of non-electrics, 305.

Magnetic discoveries of, 288;
magnetic repulsion, 285; mag-
netic theory of, 276; disputed by
Boyle, 417; Matter and Form,
284; Meteorologia of, 329; methods
of thought of, 266; "nature" dis-
cussed, 285; nature of electric,
307; negative conclusions regard-
ing elec'y, 306; nomenclature,
301; orb of virtue, 272; compared
with obs'ns of Porta and Pere-
grinus, 351; Owen's epigram on,
341; predecessors referred to, 287;
portraits and works, 260; post-
humous volume, 316, 318; pro-
posed addition to De Magnete,
316; referred to by Bacon, 318;
residence and society, 263; rela-
tions to Queen Elizabeth, 262,
264; relations to Sarpi, 344.

Scaliger's criticism, 341; ter-

603

rella of, 277; terrestrial attraction
of moon, 292; theory of elec. at-
traction, 308; theories, cosmical,
269, 294; theories compared with
those of Peregrinus, 278; con-
demned by Kircher, 366.
Gioja, Flavio, 187.
Glanvil, encyclopædia of, 160; tele-
graphic predictions, 387.
Gnomes of Middle Ages, 25.
Goddard, Jonathan, 404.
Goose, Kircher's genesis of solan,
365.

Gordon, Andrew, elec. inventions,
506 et seq.
Gottland, 134.

Gralath, Daniel, exp'ts on Leyden
jar and elec. measuring inst's,
522 et seq.

Grandamicus, mag. theory of earth,
405.

Graunt, John, refused admission to
R. Society, 409.
Gravity, and magnetism, Gilbert
on, 293; Newton co-ordinates
elec'y and mag'n with, 442.
Gray, Stephen, 470; and Dufay, 486;
Dufay's tribute to, 487; his friends,
Godfrey and Wheler, 473; exp'ts
on brush discharge, 486; on charge
resident on surface, 476; on con-
duction, 474; on elec. induction,
477; on glass tube, 472; on hair,
etc., 471; on similarity of elec.
discharge to thunder and light-
ning, 486; planetary theory and
death, 487.

Greeks, amber in literature of, 16;
amber trade of, 16; compass at-
tributed to, 54; emigration to
Egypt, 30; iron working of, 23;
nature worship of, 31.

Greene, Robert, literary references
to mag'n and elec'y, 369.
Grote, on philosophy of Aristotle,
39; of Thales, 37.

Grummert, utilization of elec. light,
508.
Guericke, Otto von, 388; and Gil-
bert compared, 393; believes earth
to be animate, 393; discovers dis-
charging effect of points, 398;
elec. conduction, 299; elec. light,
402; sound due to eiectrification,
402; elec. repulsion obs'd by, 397;
elec. terrella of, 395; forgotten in
18th cent'y, 491; hypothesis of
virtues, 392; invents air-pump,