Lake Maxinkuckee, Physical and Biological Survey 111 



Lyngbya), which 'have a lower specific gravity than water and 

 rise slowly, at an angle, to the surface. The Lyngbya is heavier 

 than the Anabsena, and comes up more slowly and not in such large 

 quantities. 



November 3. Clear and smooth; a large amount of Anabsena 

 and Lyngbya on top arranged in fine parallel lines on the water 

 surface, the lines being quite near each other and running south- 

 east and northwest. 



December 1. Some Anabsena and statoblasts near shore about 

 noon. 



December 8. Considerable foam tinged green with Anabsena 

 by the icehouses and in the Outlet. 



December 10. Some green plankton scum on cast-up foam. 

 No more scum was seen during the winter or the next spring, until 

 June 12, when the first plankton scum of the year was seen. 



In 1904, from October 17 to the end of the year when the lake 

 was under observation, no scum was noted. 



In 1906, the first scum was observed July 31, and it was noted 

 every calm day thereafter as long as the lake was under observa- 

 tion. 



August 6, the scum was very abundant along the northeast 

 shore near the Military Academy, forming a perceptible scum on 

 the lake. 



August 8, abundant among rushes off the Assembly grounds. 



August 15, much scum, composed of Anabsena and insect 

 exuvise in streaks on the water surface. A great scum of Ana- 

 bsena, insect exuvise and Vallisneria blossoms in Outlet Bay. soon 

 forming a putrescent mass. 



August 16, a little scum, and considerable diffused Anabsena. 



August 28, no scum in the morning but much diffused Anabsena 

 in clumps rising to the surface and collecting near shore. 



August 31, some scum on Twin Lakes, Anabaena and Lyngbya. 



September 4, a good lot of scum, chiefly Anabsena, on Zechiel's 

 pond. 



November 15, some green free plankton scum under the ice 

 south of Winfield's. 



In 1908, the lake was visited for only a short time and but 

 few observations could be made on the plankton. On the morning 

 of August 22, the following organisms were observed in surface 

 plankton: Lyngbya, most common, many empty sheaths; Rivu- 

 laria, a few colonies; Vallisneria flowers, abundant; Anabsena 

 flos-aqiise, a few colonies; Cyclops, a few; Moina, a few; Cypris. 

 a few; Vorticella, a minute greenish species usually two at the 



