GERMAN PLANKTON INVESTIGATIONS. 



321 



Organic 

 substances. 



Inorganic 

 substances. 





Chaetoceros 

 and other 

 Diatoms. 



Geratium 

 and other 

 Peridinese. 



Copepoda. 



Containing 



N. 



albumen. 



10 



13 



59 



chitin. 



— 



— 



4-7 



free from 



N. 



Fat. 



2-8 



1-3 



7-7 



sol. carbohydrates 



22 



39 



20 



cellulose. 



41-5 



Silica. 



545 



— 



— 



Sea salt. 



10-7 



5-2 



9-3 



Other ash. 



A. Total Dry Weight. 





Diatoms. 



Peridinese. 



Copepoda. 



Albumen 



28-7 



13 



65-1 



Chitin 



— 



— 



5-1 





Fat 



8-0 



1-37 



7-7 





Carbohydrates 



63-2 



84-9 



22-1 



B. Dry Substance free from Ash. 



Taking next the plankton as a whole, we find that the 

 autumn and winter plankton of the Baltic takes a position 

 intermediate between rich pasture and lupine. 



Albumen. Fat. Carbohydrates. Ash. 



Kich pasture 20-6 ... 4-5 ... 64.6 ... 10-1 



Autumn plankton 20-2-21-8 ... 2-1-3-2 ... 60-68-9 ... 8-5-15-7 



Lupine 20-6 ... 2-6 ... 72-0 ... 4-6 



The Peridinese in chemical constitution are very 

 peculiar, and differ markedly from the land plants used 

 as fodder. The percentage of fat is very low, while that 

 of carbohydrates, and especially of cellulose, is high. In 

 both peculiarities the Peridinese resemble good grass hay 

 or rye straw, 

 w 



