382 THE ALGAE 



of growing in the same field year after year without being manured, 

 and it has been demonstrated that this is due to the fixation of 

 nitrogen by the blue-green algae present in the soil, especially 

 species of Anabaena and Cylindrospermum gorakhporense (Singh, 

 1942) (see also p. 413). 



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Ponds 



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Blum, J. L. (1956). Bot. Rev., 22 (5), 291. 



(1957)5 Hydrobiol.y 9 (4)5 361. 



Budde, H. (1928). Arch. Hydrohiol. Plankt., 19, 433, 



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(1920). Ann. Bot. 3 34i 35- 



(1926). Ann. Bot. 3 40, 149. 



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(1957)5 J"- Ecol.y 45y 133. 



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