Chap. XXV. CORRELATED VARIABILITY. 327 



herited deficiency, either complete or partial, of the teeth. We see 

 the same connection in those rare cases in which the hair has been 

 renewed in old age, for this has " usually been accompanied by 

 a renewal of the teeth." I have remarked in a former part of 

 this volume that the great reduction in the size of the tusks in 

 domestic boars probably stands in close relation with their 

 diminished bristles, due to a certain amount of protection ; and 

 that the reappearance of the tusks in boars, which have become 

 feral and are fully exposed to the weather, probably depends on 

 the reappearance of the bristles. I may add, though not strictly 

 connected with our present point, that an agriculturist 17 asserts 

 that " pigs with little hair on their bodies are most liable to 

 " lose their tails, showing a weakness of the tegumental structure. 

 " It may be prevented by crossing with a more hairy breed." 



In the previous cases deficient hair, and teeth deficient in 

 number or size, are apparently connected. In the following 

 cases abnormally redundant hair, and teeth either deficient or 

 redundant, are likewise connected. Mr. Crawfurd 18 saw at the 

 Burmese Court a man, thirty years old, with his whole body, 

 except the hands and feet, covered with straight silky hair, which 

 on the shoulders and spine was five inches in length. At birth 

 the ears alone were covered. He did not arrive at puberty, or 

 shed his milk teeth, until twenty years old ; and at this period 

 he acquired five teeth in the upper jaw, namely four incisors 

 and one canine, and four incisor teeth in the lower jaw ; all the 

 teeth were small. This man had a daughter who was born 

 with hair within her ears ; and the hair soon extended over her 

 body. When Captain Yule 19 visited the Court, he found this 

 girl grown up ; and she presented a strange appearance with 

 even her nose densely covered with soft hair. Like her father, 

 she was furnished with incisor teeth alone. The King had with 

 difficulty bribed a man to marry her, and of her two children, 

 one, a boy fourteen months old, had hair growing out of his 

 ears, with a beard and moustache. This strange peculiarity 

 had, therefore, been inherited for three generations, with the 

 molar teeth deficient in the grandfather and mother ; whether 



17 < Gard. Chronicle,' 1849, p. 205. 



18 ' Embassy to the Court of Ava,' vol. i. p. 320. 



19 « Narrative of a Mission to the Court of Ava in 1855,' p. 94. 



