243 



peau) Fox have ou\y slightly more than 28 Vo "lore hraiii weight 

 than tliis small species. Very large domestic dogs, of about 40 kg., 



Fig. 5. 

 Skull of a fennec (Ganis zerda), in natural size. 



Fig. 6. Skull of a domestic dog of diminutive breed, in natural size. 



i.e. the mean body weight of the Wolf, have 25 '/o less brain 

 weight than this largest member of the Canidae^). 



It is now of great importance that the onlogenelic exponent is 

 equal to the exponent indicating the relation of the botiy weights or 



') Through comparison with two foxes from EVance and one wolf from America 

 Lapicque (loc.cit. p. 329) had already pointed out these differences in 1907. 

 Afterwards Klatï (Ibid , p. 36) corroborated them with more numerous data 

 through a comparison with the Jackal and the Wolf. According to Klatt's 

 records on ten (German) foxes (Ibid., p. 37) and eleven domestic dogs (Haupt- 

 labelle) of about the same size, 6.12 kg. may be taken for the body weight of 



