THE CANID^E, OE DOGS. 263 



be made in accordance with the form and strength 

 of the carnassial tooth. However, even when a 

 good idea of the Fox and Wolf type has been ob- 

 tained, the differences finally merge one into the 

 other, and thus here again comes an end to all 

 systematic arrangement. 



In all the above-mentioned animals of the dog 



2 



species the dental formula of the molars is -. The 



3 



agreement of the lobes, processes, and tubercles of 

 the teeth is such, that blood-relationship appears 

 certain if the alternative of convergence or inherit- 

 ance is properly considered. 



We must now refer to the question of the origin 

 of the domestic dog. 1 That the whole line of foxes 

 has nothing to do with the dog has long been an esta- 

 blished fact. On the other hand, Darwin endea- 

 voured to prove that various wild tribes of men in 

 different parts of the globe tamed native wolf-like 

 animals, and that the crossings of these species and 

 breeding of various kinds produced the domestic 

 dog of our day. This opinion of Darwin's has been 

 somewhat modified by L. H. Jeitteles, a careful 

 authority on the domestic animals. According to 



1 Darwin, The Variation of Plants and Animals under 

 Domestication ; Jeitteles, Die Stammvater unserer Hunde-Eassen. 

 Vienna, 1877. 



