XXIV BIOLOGICAL SOCIETY OF WASHINGTON. 



Secretaries. — F. A. Lucas, and L. O. Howard. 

 Treasurer. — F. H. Knowlton. 



Additional Members of the Council. — C. D. Waleott, F. W. 

 True, Dr. T. H. Bean, Dr. Geo. Vasey, and Dr. R. E. C. 



Stearns. 



One Hundred and Fifty-fourth Meeting. 



January 24, 1N90. 



(Tenth Anniversary Meeting. 1 



The tenth anniversary meeting was held in the law lecture 

 room of Columbian University, January 24, 1890; one hun- 

 dred and three members and guests present. 



The President, Lester F. Ward, delivered his annual address 

 on the subject The Course of Biologic Evolution.* 



:; " Published in this volume. .See p. 23. 



