Ixiv 

 April 4, 1 88 1. 



Dr. Engelmann in the chair. Sixteen members present. 



Dr. Engehnann made a communication on the temperature of 

 March. 



E. S. Holden, Director of Washburn Observatory, Madison, 

 Wis., and Henry Phillips, Jr., of Philadelphia, were elected to 

 corresponding membership. 



J. L. Buskett was elected associate member. 



Afril 18, 1881. 



Dr. Engelmann in the chair. Twelve members present. 



Dr. Wadsworth of Collinsville read a paper on the tempera- 

 ture of the American Bottom near Collinsville, compared with 

 the temperature at Collinsville and St. Louis. 



Mr. Nipher read a paper on "Certain Problems in Refraction." 



These papers were referred to the Publication Committee. 



Dr. Ferdinand v. Hochstetter of Vienna was elected to corre- 

 sponding membership. 



May 2, 1881. 



A. Todd in the chair. Eight members present. 



Edwin Harrison donated " The Anniversary Memoirs of the 

 Boston Society of Natural History, 5oih Anniversary," for which 

 the thanks of the Academy were voted. 



Mr. Nipher showed the fusion of ice at 0° C. when under un- 

 der pressure above one atmosphere. 



He also showed on the screen, by means of a lantern, the tra- 

 cing of a compound pendulum, the figure being projected while 

 forming. 



G. C. Stone was elected to associate membership. 



May 16, 1881. 



Dr. C. A. Todd in the chair. Sixty-five members and visitors 

 present. 



