146 FISH HATCHING. 



not having yet been enabled to examine the 

 fish in a sufficiently forward condition. On 

 a future occasion I hope to be enabled to 

 account for this, as also to state what position 

 the veins of the umbilical vesicle take in the 

 more mature fish. J. B. HANCOCK. 



37, Harley Street, Cavendish Square. 



Upon this interesting and important paper 

 the editor of "The Field" remarks : 



The explosion of the fallacy of the mythic duct leading to 

 nowhere, and which formed so striking and peculiar a feature 

 in the previous representations of the embryo on an enlarged 

 scale, is a most valuable fact, as clearing up the difficult points 

 in the circulation of the embryo, the eliciting of which forms 

 a step in our knowledge of these interesting little strangers, 

 for which science should be most grateful to our astute and 

 persevering correspondent, whom we beg to thank for the care 

 and skill he has bestowed on this interesting investigation. 



