BATCHELDEIi: REPORT OF SECRETARY & LIBRARIAN. 361 
Dr. A. W. Grabau. The development of the bi-serial arms in 
certain crinoids. 
Mr. J. Id. Emerton. Animal tracks in the sand. 
Dr. Thomas Dwight. Description of the human spines showing 
numerical variation in the Warren Museum of the Harvard 
Medical School. (By title.) 
November 21, 1900. General meeting. Eighty persons present. 
Dr. Thomas S. Roberts. The nesting habits of Franklin’s 
Gull in Minnesota. 
December 5, 1900. General meeting. Twenty-four persons pres¬ 
ent. 
Major William J. Davis. Fossil corals of Kentucky. 
December 19, 1900. General meeting. Eighteen persons present. 
Dr. Thomas Dwight. Numerical variation in the human spine. 
January 2, 1901. General meeting. Forty-seven persons present. 
Prof. Alpheus Ilyatt. A new law of evolution. 
January 16, 1901. General meeting. Thirty-six persons present. 
Prof. Robert DeC. Ward. The international cloud classification. 
Messrs. Gerrit S. Miller, Jr., and James A. G. Rehn. System- 
atic results of the study of North American land mammals 
to the end of the year 1900. (By title.) 
February 6, 1901. General meeting. Twenty-seven persons pres¬ 
ent. 
Prof. J. S. Kingsley. Origin of the Mammalia. 
February 20, 1901. General meeting. Ninety-eight persons pres- 
' ent. 
Prof. William Morris Davis. The Grand Canon district of 
Arizona : a technical geological discussion. 
March 6, 1901. General meeting. Thirty-five persons present. 
Mr. Samuel C. Prescott. On the applications of bacteriology 
to Certain arts and industries. 
Prof. Hubert Lyman Clark. Eckinoderms from Puget Sound. 
Observations made on the echinoderms collected by the par¬ 
ties from Columbia University, in Puget Sound in 1896 and 
1897. (By title.) 
Prof. Hubert Lyman Clark. Bermudan* echinoderms. A re- 
•/ 
port on observations and collections made in 1899. (By 
title.) 
March 20, 1901. General meeting. Forty-seven persons present. 
Mr. J. H. Emerton. The cobweb spiders, with photographs of 
their webs. 
