28-31, 1907; from the Smithsonian Institution, informing the Academy of the election of Charles Doolittle Walcott as its Secretary; from G. Capellini, inviting the Academy to participate in the celebration of the three hundredth anniversary of the death of Ulisse Aldrovandi, June 12, 1907, at Bologna; also, printed communications regarding the adoption of an international language.

On motion of the Recording Secretary, it was unanimously Voted, To invite Dr. William Everett, Professor Amos E. Dolbear, and Mr. Henry G. Denny to attend the meetings of the Academy, and to make use of the library.

The Chair announced the following death:

Dimitri Mendeleeff, Foreign Honorary Member in Class I, Section 3.

The following gentlemen were elected Members of the Academy:

William Zebina Ripley, of Newton, as Resident Fellow in Class III, Section 3 (Political Economy and History).

Edward Henry Hall, of Cambridge, as Resident Fellow in Class III, Section 4 (Literature and the Fine Arts).

William Coolidge Lane, of Cambridge, as Resident Fellow in Class III, Section 4 (Literature and the Fine Arts).

Magnus Gustav Retzius, of Stockholm, as Foreign Honorary Member in Class II, Section 3 (Zoology and Physiology), in place of the late Albert von Kölliker.

Hermann Diels, of Berlin, as Foreign Honorary Member in Class III, Section 2 (Philology and Archaeology), in place of the late J. W. A. Kirchhoff.

The President appointed the following Councillors to act as Nominating Committee:

WILLIAM T. SEDGWICK, of Class II.

ELIHU THOMSON, of Class I.

ANDREW MCF. DAVIS, of Class III.

The following Communications were given:

Professor S. P. Sharples, "Cobalt and Silver Deposits of Cobalt, Canada."

Professor D. W. Johnson, "The Volcanic Necks of the Mt. Taylor Region, New Mexico" (by invitation).

The following papers were read by title : —

"The Process of building up the Voltage and Current in a Long Alternating-Current Circuit." By A. E. Kennelly. "High Electromotive Force with its Application to Spectrum Analysis." By John Trowbridge.

Nine hundred and seventy-third Meeting.

APRIL 10, 1907.

The PRESIDENT in the chair.

There were present sixteen Fellows.

The Corresponding Secretary read the following letters: From Edward H. Hall, William C. Lane, and William Z. Ripley, acknowledging election as Resident Fellows; from Hermann Diels, acknowledging election as Foreign Honorary Member; from Amos E. Dolbear and Henry G. Denny, thanking the Academy for its invitation to attend the meetings and to use the library; from the Geological Society of London inviting the Academy to appoint a delegate to attend its centennial celebration, September 26, 27, and 28, 1907; from the Comité Géologique de la Russie, announcing the death of M. Nicholas Sokolow; from Columbia University in the City of New York, announcing the Loubat prizes to be awarded in 1908. The Chair announced the following death:

Marcellin Berthelot, Foreign Honorary Member in Class I, Section 3.

The following delegates were appointed by the chair:Professor Ephraim Emerton (Professor Angelo Celli of Rome, alternate), to attend the celebration at Bologna of the three hundredth anniversary of the death of Ulisse Aldrovandi, June 12, 1907; President James Burrill Angell, to attend the celebration at Lansing, Michigan, of the fiftieth anniversary of the Michigan Agricultural College, May 28 to 31, 1907; Professor Edward Laurens Mark, to attend the Seventh International Zoological Congress at Boston, August 19 to 23, 1907. The following communications were given:

"On the Physiological Basis of Illumination." By Dr. Louis Bell.

"Meteorological Observations in 1906 above the Tropical and Equatorial Atlantic." By Professor A. Lawrence Rotch.

The following paper was presented by title:

"The Demagnetizing Factors for Cylindrical Magnets of Different Dimensions." By C. L. B. Shuddemagen. Presented by B. O. Peirce.

Nine hundred and seventy-fourth Meeting.

MAY 8, 1907.- ANNUAL MEETING.

The PRESIDENT in the chair.

There were present twenty-two Fellows.

Letters were read from E. F. Sawyer and J. S. Kingsley, resigning Fellowship; from Gustav Retzius, acknowledging election as Foreign Honorary Member; from the New York Academy of Sciences, inviting the Academy to be represented at the celebration of the two hundredth anniversary of the birth of Carl von Linné, and also to contribute an official document appreciative of the work of Linné.

On motion of the Recording Secretary it was

Voted, That the appointment of Delegates to the celebrations of the Geological Society of London and the New York Academy of Sciences be intrusted to the President.

The Chair announced the death of Sir Michael Foster, Foreign Honorary Member in Class II, Section 3.

The annual report of the Council was read.1

The annual report of the Treasurer was read, of which the following is an abstract:

The following reports were also presented:

REPORT OF THE LIBRARIAN.

During the past year the Assistant Librarian and Miss Wyman, as cataloguer, have been employed in verifying and continuing the typewritten catalogue, begun by Dr. Holden, and also in classifying the books according to the classification adapted by him to this library. The subjects, mathematics, astronomy, physics, light, heat, electricity, chemistry, the useful arts (including engineering), natural history, geology, mineralogy, and about one-half of meteorology, are entirely catalogued and classified. This includes all serial publications relating to the subjects mentioned. There remains to be done, paleontology, botany, zoology, agriculture, medicine, the moral and political sciences, and the books and serial publications on general science. As Miss Wyman can only give two or three hours a day during the coming year, the catalogue will probably not be completed for some months, but the thoroughness with which the work has been done compensates for the length of time taken.

It is very much to be desired that each member of the Academy should present to the library a copy of any scientific work of which he is the author. The books on the various subjects were, as a rule, well chosen in the past, and form what might be called the nucleus to a valuable library, but some years ago, through lack of funds, it was decided to purchase no more books from the General Fund; therefore donations are much needed.

The accessions during the year have been as follows:

61 books have been borrowed from the library by 18 persons, including 10 Fellows. The library has been consulted many times when no books were taken.

All the books borrowed during the year have been returned for the annual examination. Of the books reported as still out a year ago, all have been returned except 5 (taken out by one person).

The expenses charged to the library are as follows: Miscellaneous, $400 (which includes $206.25 for cataloguing); Binding, $417.65, General, and $44.70, Rumford, Funds; Subscriptions, $381.89, General,