BATCHELDER : REPORT OF SECRETARY AND LIBRARIAN. 235 
the year. The attendance has varied from twenty-eight to ninety- 
three, the average being about fifty-one. 
Nineteen formal communications have been made at the meetings 
by fifteen persons, and eight papers have been presented by title. 
The lantern has been used to illustrate papers at eleven meetings. 
The meetings, attendance and communications have been as 
follows: — 
May 3, 1899. Annual meeting. Thirty-four persons present. 
Reports of the Curator, Secretary, Librarian, Treasurer, and 
Trustees. 
Mr. W. L. Tower. A quantitative study of the migration and 
variation of the Colorado potato-beetle. 
May 17, 1899. General meeting. Thirty-one persons present. 
Prof. Alplieus Hyatt. Exhibition of Gage’s series of brook 
and lake lampreys from New York. 
Mr. A. W. Grabau. Evolution of the Fusidae. 
November 1, 1899. General meeting. Seventy-seven persons 
present. 
Prof. W. M. Davis. Geographical notes of a year in Europe. 
Dr. H. S. Pratt. The embryonic history of imaginal discs in 
the brachyceran Diptera. (By title.) 
Mr. Glover M. Allen. The species of Evotomys of eastern 
North America. (By title.) 
Mr. Arthur M. Edwards. Diatoms of the U. S. geological 
survey of the Territories. (By title.) 
November 15, 1899. General meeting. Sixty-one persons present. 
Mr. J. G. Jack. Forest aspects and problems in central 
Colorado. 
December 6, 1899. General meeting. Ninety-three persons present. 
Mr. William Brewster. Nesting habits of some New England 
birds. 
Mr. H. T. Burr. The discovers of fossils in the Roxburv con- 
*/ «/ 
glomerate. 
Dr. R. P. Bigelow. Anatomy and development of Cassiopea 
xamachana. (By title.) 
December 20, 1899. General meeting. Forty-five persons present. 
Mr. A. W. Grabau. Notes on a geological excursion in the 
Rockv Mountains of Colorado. 
t/ 
Mr. R. IT. Howe, Jr. Description of a new race of Ilorizopus 
virens (Linn.). (By title.) 
