42 The Chicago Academy of Sciences. 



The gathering of members and friends was addressed 

 in the new and beautiful assembly hall, by Mr. Luther 

 Laflin Mills, representing the Laflin family; by Dr. 

 Thomas C. Chamberlin, of the University of Chicago; 



YELLOW BILLED TROPIC BIRD. 



by Dr. Sarah Hackett Stevenson, and Dr. Selim H. 

 Peabody, president of the Academy. 



The Academy's history may be divided into three 

 distinct and interesting periods. Each period is marked 

 by a series of successes and reverses. 



The first period includes the time from the move- 



