NO DUCT EXISTS. 145 



caval) bordering the front part of the vesicle, 

 as shown in No. 1, and returned to the 

 heart, taking with it a portion of the contents 

 of the vesicle received by absorption, which, 

 being transmitted to the liver, is there assimi- 

 lated and again conveyed to the heart by the 

 large vein, shown in drawing No. 2, for circu- 

 lation in the body of the fish. 



This I consider the right view to take of 

 the mode of nutrition in the young salmon, 

 the idea of the duct being as preposterous as 

 it is incorrect. If, however, I am wrong, I 

 shall still rejoice to have opened a door to 

 discussion on a subject which has hitherto 

 occupied so little consideration amongst men 

 of science. 



What eventually becomes of the outer sac 

 of the vesicle I am not in a position to state, 



