2l8 



As in the father's case, the inside of Fedor's nostrils and 

 ears has a thick crop of hair. Both father and son are 

 almost toothless, Andrian having only five teeth, one in the 

 upper jaw, and four in the lower, while the child has only 

 four teeth, all in the lower jaw. In both cases the four 

 lower teeth are all incisors. To the right of Andrian's one 

 upper tooth there still remains the mark of another, which 

 has disappeared. That beyond these six teeth the man 

 never had any others, is evident to anyone who feels the 

 gums with the fingers. The deficiency of teeth, accompanied 

 as it is by what is in reality a deficiency, not a redundancy 

 of hair, accords well with Darwin's view that a constant 

 correlation exists between hair and teeth. He mentions 

 as an illustration the deficiency of teeth in hairless dogs. 

 The tusks of the boar, again, are greatly reduced under 

 domestication, and the reduction is accompanied by a 

 corresponding diminution of the bristles. He mentions 

 also the case of Julia Pastrana, a Spanish dancer or opera 

 singer, who had a thick masculine beard and a hairy forehead, 

 while her teeth were so redundant that her mouth projected, 

 and her face had a gorilla-like appearance. It should rather 

 be said that in general those creatures which present an 

 abnormal development in the covering of their skin, whether 

 in the way of redundancy or deficiency, present generally, 

 perhaps always, an abnormal dental development, as we see 

 in sloths and armadilloes on the one hand, which have the 

 front teeth deficient, and in some branches of the whale 

 family, on the other, in which the teeth are redundant, either 

 in number or in size. 



To the foregoing cases many more might be added showing 

 the undoubted heritability of cutaneous physiological abnor- 

 malities ; but I would now go further, and assert that the 



