10 



Alice Osborne: Circulation of a Frog. 



As a result of this alteration in the course of the blood supply one 

 might expect to find the kidney of the right abnormal side enlarged ; 

 but this was not so, both kidneys being of normal size. 



It is difficult to find any reason for this abnormality, but it seems 

 possible that during early development the Renal portal vein split 

 into two along its length, and likewise part of vessel Y, the two 

 vessels separated widely, and the two halves of Y separated along 

 the divided part of their lengths, but kept a connecting link showing 

 where the splitting ceased. 



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