115 — 



26. 



27. 



L894. Whipple, G. C, Some observations on the growth 



of Diatoms in surface waters. Technol.Quart., VII, 



L894, pp. 2] t-231. 

 1899. ZACHARIAS,0., Ueber einigebiologischeUnterschiede 



zwischen Teichen and Seen. Biolog. Centralbl., XIX. 



1899, pp. 313-319 



vV.ios 



c 



[lu L I B R A R Y 



» 



^AS&' v O 



# 



V 



- 



