CULTIVATING ALGAE MEIER 381 



In this paper I have not attempted to mention all the scientists 

 who have contributed to our present knowledge of algology. The 

 student who has collected a bottle of pond water and is eager to 

 classify its contents as he selects his algae for pure culture will find 

 assistance and pleasure in the works of such men as Chodat (1913), 

 Wolle (1887), Pascher (1927), West and Fritsch (1927), Wille (1897), 

 Collins (1909), and many others. 



Algae can be found growing everywhere, for they can exist under 

 very varied temperature conditions. Ponds, lakes, rivers, waterfalls, 

 bogs, rain pools, ditches, wet rocks, damp ground, tree trunks, and 

 fence posts are some of the places where they may be observed. The 

 infinite pains and boundless patience required to obtain an alga in 

 pure culture are fully recompensed by the satisfaction of watching a 

 beautiful green or orange button-shaped colony composed of millions 

 of cells develop from one or a few cells whose presence in a drop of 

 water could only be detected by the use of the microscope. 



SELECTED LITERATURE FOR THE STUDY OP ALGAE 



Bknecke, W. 



1898. Uber Kiilturbediiigungen einiger Algen. Bot. Zeit., vol. 56, pt. 5, 

 pp. 83-96. 

 Betebinck, M. W. 



1890. Cultiu-versuche mit Zoochlorellen, Lichengonidien und anderen 

 niederen Algen. Bot. Zeit., vol. 48, pp. 725-739, 741-754, 757-768, 781-785. 

 C HOD AT, R. 



1902. Algues vertes de la Suisse. Beitr. Kryptogamenflora Schweiz, vol. 1, 



pt. 3. Zurich. 

 1913. Monographies d'Algues en Culture Pure iu Mat^riaux pour la flore 



cryptogamique Suisse. Berne. 

 1929. La mutation g4n6ralis§e et les mutations cliez le Chlorella rubescens 

 Cbod. Arch. Sci. Phys. Nat., ser. 5, vol. 11, pp. 31-38. Geneva. 

 Collins, Frank Shipley. 



1909. The Green Algae of North America. Tufts Coll. Studies, vol, 2, 

 No. 3. 

 CooKE, M. C. 



1882. British Fresh Water Algae. London, 

 Emerson, Robert. 



1927. The Effect of Certain Respiratory Inhibitors on the Respiration of 



Chlorella. Journ. Gen. Phys., vol. 10, pp. 469^77. 

 1929. Chlorophyll Content and Rate of Photosynthesis. Proc. Nat. Acad. 



Sci., vol. 15, pp. 281-284. 

 1929. Relation between Maximum Rate of Photosynthesis and Concentra- 

 tion of Chlorophyll. Journ. Gen. Phys., vol. 12, pp. 609-622. 



1929. Photosynthesis as a Function of Light Intensity and of Temperature 

 with Different Concentrations of Chlorophyll. Journ. Gen. Phys., vol. 12, 

 pp. 623-629. 



1930. The Chlorophyll Factor in Photosynthesis. Amer. Nat., vol. 64, 

 pp, 252-260. 



