Chap. XXV. COERELATED VARIABILITY. 321 



molar teeth deficient in the grandfather and mother; whether 

 these teeth would likewise fail in the infant could not then 

 be told. 



A parallel case of a man fifty-five }'ears old, and of his son, 

 with their faces covered with hair, has recently occurred in 

 Russia. Dr. Alex. Brandt has sent me an account of this 

 case, together with specimens of the extremely fine hair 

 from the cheeks. The man is deficient in teeth, possessing 

 only four incisors in the lower and two in the upper jaw. 

 His son, about three years old, has no teeth except four 

 lower incisors. The case, as Dr. Brandt remarks in his letter, 

 no doubt is due to an arrest of development in the hair and 

 teeth. ^Ye here see how independent of the ordinary con- 

 ditions of existence such arrests must be, for the lives of a 

 Russian peasant and of a native of Bnrmah are as different 

 as possible. 22 



Here is another and somewhat different case communicated 

 to me by Mr. Wallace on the authority of Dr. Purland, a 

 dentist : Julia Pastrana, a Spanish dancer, was a remarkably 

 fine woman, but she had a thick mascnline beard and a 

 hairy forehead ; she was photographed, and her stuffed skin 

 was exhibited as a show ; but what concerns us is, that she 

 had in both the upper and lower jaw an irregular double set 

 of teeth, one row being placed within the other, of which Dr. 

 Purland took a cast. From the redundancy of teeth her 

 mouth projected, and her face had a gorilla-like appearance. 

 These cases and those of the hairless dogs forcibly call to 

 mind the fact, that the two orders of mammals— namely, the 

 Edentata and Cetacea — which are the most abnormal in their 

 dermal covering, are likewise the most abnormal either by 

 deficiency or redundancy of teeth. 



The organs of sight and hearing are generally admitted to 

 be homologous with one another and with various dermal 

 appendages ; hence these parts are liable to be abnormally 

 affected in conjunction. Mr. White Cowper says " that in all 

 " cases of double microphthalmia brought under his notice he 



22 I owe to the kindness of M. both of whom have since been ex- 

 Chauman, of St. Petersburg, excellent hibited in Paris and London, 

 photographs of this man and his son, 



