8 4 



EVOLUTION AND DISEASE, 



be found in other mammals, especially as the gill-slits arc 

 as marked in them as in the human species. The inquiry 

 is full of interest. Our knowledge of branchial fistulae 

 in mammals other than man is very scanty ; this is 

 not matter for surprise, as it is only of recent years 

 that information regarding these fistulae in him has 

 been very exact or abundant. 



FIG. 42. A Goat with cervical auricles. 



Heusinger * mentions the occurrence of congenital 

 fistulae in the horse immediately below the ear, and 

 near the angle of the jaw. He stated that they are 

 more frequently recognized in carriage than in draught 

 horses ; the secretion or discharge which issues from 



1 " Deutsche Zeitschrift fur Thiennedicin," Bd. ii. 



