30 



C. W. M. Poynter 



stitute about half of the cases. The anomaly seems to be unin- 

 fluenced by sex, and there seems to be no relation between super- 

 numerary arteries and veins ; the latter is the rajer anomaly. 



There is a wide discrepancy in the text-books as to the frequency 

 of multiple renal arteries which the following table may help to 

 clear up : 



The larger percentages of the table include the cases in which 

 the renal vessel divides into two or three branches just before 

 entering the kidney. 



The following report five or more accessory arteries : Macalister 

 (1883), Mahon (1889), Kater (1901), Jolly (1896), Young 

 (1903), Kubo (1907), Gray (1906), Poynter. 



A. Spermatica Interna 



It has been reported lacking, Bartholin (1654), and double, 

 Gerard (1913). It shows a wide range of origin not alone along 

 the aorta, but from its branches, Barkow (1868), Hyrtl (1873), 

 Krause (1876), Kolster (1902), Gerard (1913), Rupert (1913), 

 Stopford (1913). 



Kolster found the origin from the renal artery not infrequent. 

 Accessory spermatics have been reported by Hughes (1892) and 

 by Pohl (1773) ; I saw one case that was double for about half its 

 length, having one root from the renal and the other from the aorta. 



