80 proceedings: biological society 



mostraca occurred (Sida, Scapholeberis, Simocephalus) , varying in num- 

 bers with the density of growth to a maximum of 178,000 individuals, 

 with estimated volume of 23 cc. per cubic yard. 



Streams and sloughs filled with back flow from the lake "ripened" 

 earlier than the main lake body, and contained upwards of 50,000 

 Entomostraca per cu. yd. in July, with less, usually, in August. Algae 

 were less than in the lake. Where tributaries were filled by their own 

 waters, plankton was of different character. When in flowing streams 

 often protozoans (Euglena) or rotifers (Asplanchna) were dominant, 

 with little algae. When tributaries were filled with seepage water 

 the plankton again was of special character, holozooplanktonic, with 

 one or another Entomostracan species dominant, as Cyclops leuckarti 

 and Diaptomus spp. Some of these characteristic forms could be 

 traced into the main stream, but they did not survive. It is evident that 

 there is a vast increase of fundamental food for some species of fishes. 



The paper was illustrated with map, diagram and slides showing 

 the conditions existing in the summer of 1914. It was discussed by 

 the Chair, and by Messrs. Coker, Marsh, and William Palmer. 



The 547th and 36th annual meeting of the Society was held in the 

 Assembly Hall of the Cosmos Club, Saturday, December 18, 1915; 

 called to order by President Bartsch, with 27 persons present. 



On recommendation of the Council the following persons were 

 elected to active membership: H. R. Rosen, U. S. National Museum; 

 Miss Virginia Boone, U. S. National Museum; Ira N. Gabrielson, 

 Biological Survey; James Silver. 



Annual reports of officers and committees were submitted. 



Election of officers for the year 1916 resulted as follows: President, 

 W. P. Hay; Vice-Presidents, J. N. Rose, A. D. Hopkins, Hugh M. Smith, 

 and Vernon Bailey; Recording Secretary, M. W. Lyon, Jr.; Corre- 

 sponding Secretary, W. L. McAtee; Treasurer, W.W.Cooke; Coun- 

 cillors, N. Hollister, J. W. Gidley, William Palmer, Alex. Wet- 

 more, E. A. Mearns. 



President Hay was elected as the Society's representative upon the 

 board of the Washington Academy of Sciences. 



The president announced the following committees: Committee on 

 Publications: N. Hollister, W. L. McAtee, W. W. Cooke; Com- 

 mittee on Communications: Wm. Palmer, Alex. Wetmore, Lewis 

 Radcliffe, J. W. Gidley, William R. Maxon, H. S. Barber. 



M. W. Lyon, Jr., Recording Secretary. 



