on the sun. The fifth relates to the effect laily and annual variations in the horizontal tic force. The sixth relates to the lunar l magnetic force. s been given of the result of all these invesy to corroborate the conclusions arrived at r parts of the world, that both the sun and , and exert an influence upon the polarity at the magnetism of the sun has variations. some way connected with the appearance ving rise to the variations in those perturbah have been called magnetic storms, and 1 recurrence at an interval of about eleven uld be supported perfectly free in space, so on into which it would be brought by the arth, it would arrange itself in the line of the inclination of the needle. At the magch such a needle would be parallel to the om this line either to the north or the south, ease continually until we arrive at the magDe vertical. It is plain that the full magnetic line of the dip, may be resolved into two force, or that which draws the ordinary the meridian when it has been deflected second, the vortical force which tends to le down into the line of the dip. The fre a series of observations e corrections due to this ially heated and cooled; educed from an investitions compared with the rly register of the ther terwards applied to all ere then separated from as had been done with means the effect of the exhibited analytically and at the number and aggre1844; that in each year n March and September, ords, the maximum about solstices. The ninth part gives the inves ion of the appearance of f the direction and force om the result of this disof about eleven years in ora, as well as in that of hat these are coincident the spots on the sun. scussion of the daily and n on the vertical compotion of the force is deter1 for the whole year, and -ly. These are expressed nation of the curve shows principal minimum about y maximum about 2 a. m., A comparison is also given i 1st. To illustrate the topogra 1. The study of the more he investigation of the influence of the moon also upon the direction and intensity of the ds of investigation are the same in this as in The daily effects of the moon exhibit a prinefore the planet passes the upper meridian, a about three hours after it passes the lower epoch of the tide of vertical force is about ivance, apparently, of the culmination of the iation of this force, though noticed, is very the time of greatest lunar disturbance is yet ped, and more observations in regard to it given in this paper between the observations hiladelphia, and their accordances or differffect of the moon upon the direction and intens obtained by a combination of the vertical ats. From this part of the investigation it greatest at 8 and 20 hours, and least at 3 › being equal to 3.6 seconds; and also that f the earth is greatest at half-past 12 and 11, hours, the results, from the observations at a, being remarkably coincident. e foregoing list is that by Dr. Dean, which of the medulla oblongata, both human and west roots of the hypoglossal nerve, through auditory, including the hypoglossal, nasal, ens, facial, and auditory nerves. The obn were principally as follows: opography of the medulla oblongata by means hs, which might completely map out all the cture as they successively occur, connected the different nerves, with the details which ent of their nuclei and accessory ganglia. nore minute histological details, such as the . their entrance into their respective nuclei oblongata, a , that the plan of strucarrangement of parts e nerve roots to their er the connexion estabd out on the same plan. by the author himself photography. For the ns have been copied on he steel plates were enmited number of photohave been prepared by nd from these negatives application to the author O years of constant study, the United States army, mination, and was recome addition both to human n is on the Palæontology F. V. Hayden. ms of all the known invergical formations of Idaho, as. About 370 species, bed, and the descriptions s of each species to allied nd Europe, both living and stribution, &c. The illusfully drawn figures, occu es, the work also contains ch these fossils belong, with Is on its affinities to other gns the probable period of family description the names of The first sketch of this w Miscellaneous Collections.- The first of these seri re likewise given; and at the end of each ames of all the genera, whether living or excontains detailed descriptions of the various hese fossils existed, with remarks on their American and European deposits. n of the specimens described and figured were Hayden in the several expeditions into the issouri and Yellowstone, sent by the governnd of Lieutenant (now Major General) G. K. | States Topographical Engineers, to whose l encouragement we are indebted for much of a the work is founded. But besides these, a ected by Dr. Hayden himself previous to his loring expeditions of the government. The he fossils described in this work are therefore ring in the joint names of Meek and Hayden, of the genera, and families, and the discussion ogical range, geographical distribution, &c., Mr. Meek alone. is work was prepared as a part of the report orations of the above-mentioned regions, but oted almost three years exclusively to extendinvestigations; and as it is probable that Convision for its publication, it has been adopted he earnest recommendation of several eminent published in successive parts. All the specithe collections of the Institution, and as soon d the numerous duplicates will be distributed, , to various scientific institutions at home and ns.-Several series of articles forming parts of ctions, as stated in previous reports, have been ome have been completed, some are still in been printed during the past year. eries is that relating to the shells of North st of the following works: |