REPORT OF ASSISTANT DIRECTOR. 23 



Theodore Gill and John A. Ryder. — The evolution and homologies of the ilukes 

 of cetaceans and sirenians. 



Ira Remsen. — Chemical action in a magnetic field. 



A- Graham Bell. — The measurement of hearing-power. 



A. GraHam Bell and F. Della Torre. — On the possibility of obtaining echoes 

 from ships and icebergs in a fog. 



THE AMERICAN FISHERIES SOCIETY. 

 May 5-6. 



'Opening address, Hon. Theodore Lyman, president of the society. 

 Appointment of committees and other business. 



R. E. C. Stearns.— The giant clams of Puget Sound. 



James A. Henshall, M. D. — Hibernation of the black bass. 



Fred. Mather. — Smelt hatching. 



Frederick W. True. — The porpoise fishery of Cape Hatteras. 



Frank N. Clark. — Results of artificial propagation and planting of whitefish in the 

 Great Lakes. 



A. Nelson Cheney. — Does transplanting affect the food or game qualities of certain 

 fishes ? 



J. S. Van Cleef. — How to restore our trout streams. 



Tarleton H. Bean. — Exhibition of complete series of salmon and trout of North 

 America. 



Marshall McDonald.— Objective points in fish culture. 



W. V. Cox. — A glance at Billingsgate. 



Fred. Mather.— Work at Cold Spring Harbor. 



Eugene G. Blackford— Oyster-beds of New York. 



John A. Ryder. — On some of the protective contrivances developed by and iu con- 

 nection with the ova of various species of fishes. 



O. T. Mason. — The use of the, thro wing-stick by Eskimo in fishing. 



Theodore Gill. — The chief characteristics of North American fish fauna. 



Marshall McDonald.— Suggestions as to the development of oyster culture in the 

 Chesapeake area. 



Charles G. Atkins.— Biennial spawning of salmon. 

 The roll of membership now includes about 150 names, 24 new members having 



been elected during this meeting. 



BIOLOGICAL SOCIETY OF WASHINGTON. 



'The Biological Society of Washington, as heretofore, has held its fortnightly meet- 

 ings in the lecture hall of the National Museum. 



January 24. 

 The fifth anniversary meeting of the society. 

 The retiring president, Prof. Charles A. White, delivered an address upon " The 

 Application of Biology to Geological History." 



communications. 



February 7. 



Dr. Theodore Gill. — The relative values of different types in paleontology. 

 Dr. H. G. Beyer, U. S. N.— Report on intracellular digestion and its relations to 

 pathology. 



