150 



Investigation* on flip Life-History 



TABLE IV. 



Percentage of Lecithin in Ovaries and Miisde. 

 ESTUARY FISH. 



UPPER-WATER FISH. 



Table V. gives the lecithin per Standard Fish. 



TABLE V. 



Lecithin per Standard Fish in Ovaries and Muscle. 

 ESTUARY FISH. 



UPPER WATER FISH. 



Gain of ovaries, 63'3 gnns. Loss of muscle, 19'2 grms. 



From this Table it is seen that the gain of lecithin in the ovary is 

 enormously in excess of the loss of lecithin from the muscle. The 

 muscle per unit of length lost only 19'2 grms., while the ovary gained 

 no less than 63 - 3 grms. 



The source of the fatty acids of the ovarian lecithin presents no diffi- 



* It has already been shown (p. 146) that the extraction of lecithin by ether from the ovaries is 

 probably not complete. In the "ovary there is thus even a larger quantity than is indicated by 

 these figures. 



