200 JOHN LEWIS BREMER 



mesenteric artery. Also a spermatic branch of the renal artery 

 may be due to an early connection of a mesonephric artery with 

 the kidney, normally lost. The kidne}" is probable never with- 

 out arterial blood. 



3. A periaortic plexus with many roots from the aorta exists 

 in part in the mammals studied, affording an opportunity for the 

 change of position of main aortic branches, and supplying smaller 

 branches for possible future use. 



4. The renal artery is derived from this plexus or from such 

 parts of it as exist just before the kidney receives its capsule. 



5. The channel for the renal artery is selected mechanically, 

 and differs in different animals with the size of the Wolffian body, 

 the greater or lesser curvature of the rump region, and probably 

 other physical peculiarities. 



6. Channels not so convenient may be utilized if the usual 

 channel is occluded; hence the renal variations and anomalies. 



(1 



(2 



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(4 



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(10 

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 (12 

 (13 



(14 

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(16 



(17 

 (18 



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Evans, H. M. 1912 In Keibel and Mall's Human Embryology, vol. 

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