No. 608] SHORTER ARTICLES AXD DISCUSSION 501 



viduals, if not in species. And no furtluT denionstration of 

 the presence of this faunu is re(iiiiivd than for one to visit the 

 lake and see, with his own eyes, the water literally teeming with 

 animal life. 



The presence of plants is not so evident to the casual observer, 

 although, at certain times of the year, clumps of greenish ma- 

 terial, which must at least suggest a vegetable growth, are very 

 plentiful. Areas of a green scum on the surface of the water 

 in more or less protected places also give evidence, directly, of 

 the presence of plants. 



The original purpose of this paper was to determine, if pos- 

 sible, the effect as to size of cells and rapidity of growth of dif- 

 ferent densities of Great Salt Lake water on a species of Chlamy- 

 domonas which is found there. The problem, then, was to have 

 been purely a physiological one. During the course of investi- 

 gations along this line, however, other interesting things pre- 

 sented themselves, and a deviation was made from the first plan, 

 so that finally observations were extended to include every 

 species of plant found in the part of the lake investigated. 



The observations made covered a small portion of the southern 

 end of the lake at what is known as Saltair Beach. This place 

 is easily accessible, and is at such a distance from any stream 

 entering the lake, that the density of the water there is not af- 

 fected to any degree. 



The following plants are found regularly in the water at that 

 place: 



A green alga, Chlamyclomonas sp., which has been examined 

 by Dr. N. L. Gardner. Dr. Gardner believes it to be a new species 

 — he has not yet published a decription — near to Chlamydomonas 

 glceocystiformis Dill, and Clilamydomonas apiocystiformis ar- 

 tari. It has a rich green color, and occurs, during the warmer 

 weather, on the surface of the water in many more protected 

 places. It is found in less numbers in whatever decaying plant 

 or animal material may be present. The indications are that 

 this is one of the means the plant has of surviving the winter; 

 since such material brought into the laboratory in the very cold- 

 est weather has later developed a rich green growth of the alga. 



A blue-green alga, determination of which has been made by 

 Professor W. A. Setchell. He says that it certainly is an 

 Aphanotheca, and is undoubtedly the same plant as the one 

 named Polycystis packardii by Farlnw, and probably also the 



