•^■i CLEVELAND 



DIATOMS 

 JUNE 2-19,1929 

 ^ SURnC£ 

 (^ BOTTOM 

 O 400 PtR LrTEfl 

 (~)».000 PER LITER 

 STATUTE MILES 



Figure 44. - -Distribution of diatoms at the surface and bottom, June and July, 

 1929. The circles represent spheres whose volumes stand for the 

 number of organisms per liter at the respective stations. The 

 diameters in figures 44 and 45 should be doubled for a direct 

 comparison of relative abundance with figures 47-49. 



129 



