114 Lake Maxinkuckee, Physical and Biological Survey 



to obtain examples of the different microscopic forms in and about 

 the lake. During the winter, while raking up the various weeds 

 of the bottom through holes cut in the ice, it was observed that 

 they were thickly populated by various organisms, and by washing 

 them off a great amount of interesting material was obtained. On 

 one occasion it was observed that the drippings of Chara raked up 

 at the Weedpatch stained the snow a bright green, and an investi- 

 gation showed this to be due to myriads of green Stentors. 



During the sounding of the lake in the winter it was noted that 

 entomostraca (Cyclops) flocked up in considerable numbers to the 

 openings cut through the ice for soundings. 



With the coming of spring it was observed that the ponds and 

 pools in the region of the lake were teeming with small forms of 

 life different from those found in the lake. The ponds were too 

 small and shallow to permit the use of the towing-net, so the water 

 was dipped up and the various forms strained out and preserved. 



From March 25 to June 28, on trips to the Deephole to take 

 temperatures, the towing-net was usually fastened to the boat and 

 hauled one way. Usually large catches were obtained. On some 

 days the hauls would consist chiefly of entomostraca and the mass 

 had the general appearance of a yellowish jelly. On other occa- 

 sions it was almost entirely diatomaceous (Asterionella) in which 

 case it had a peculiar bristling appearance and was hard and 

 gritty to the touch. 



During the summer and early autumn of 1906, beginning about 

 July 26, when diffused plankton began to show through the water, 

 frequent hauls were made with the towing-net with the following 

 results : 



July 26, 1:30 p.m., faintly bright and calm; towing in Outlet 

 Bay, from Chadwick's pier to the ice office, Lyngbya sestuarii, 

 common; Diaptomus, small species; casts of shells of amphipods; 

 Botryococcus braunii. 



July 27, hauls at morning and again at noon, secured Lyngbya, 

 only a few filaments ; Botryococcus braunii, a few colonies ; Diapto- 

 mus, common; Daphnia, a few. 



July 30, haul over the same grounds with the same results. The 

 Inlet seemed full of suspended algae, which was so fine it strained 

 through the towing-net. 



July 31, in a haul across Outlet Bay was obtained a great mass 

 of entomostraca ; the water was full of suspended flocculent algae ; 

 but it escaped the net. By noon the water by the ice-house pier 

 was full of suspended algae (Anabaena) and in dips taken with the 

 finer net, a good many statoblasts were obtained. Plankton scum 

 first appeared. 



