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THE POPULAR SCIENCE MONTHLY.— SUPPLEMENT. 



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 An- 

 drian'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 any one who feels the gums 

 with the finger." 



The deficiency of teeth, accompanied as it is 

 by" what is in reality a deficiency not a redun- 

 dancy of hair — for Andrian and his son have no 

 real hair — accords well with Darwin's view, that 

 a constant correlation exists between hair and 

 teeth. He mentions as an illustration the defi- 

 ciency of teeth in hairless dogs. The tusks of 

 the boar, again, are greatly reduced under do- 

 mestication, 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 pro- 

 jected, and her face had a gorilla-like appearance. 

 It should rather be said that in general those 

 creatures which present an abnormal develop- 

 ment in the covering of their skin, whether in 

 the way of redundancy or deficiency, present gen- 

 erally, perhaps always, an abnormal dental de- 

 velopment, as we see in sloths and armadillos on 

 the one hand, which have the front teeth defi- 

 cient, and in some branches of the whale family 

 on the other, in which the teeth are redundant 

 either in number or in size. In individual mem- 

 bers of the human family it certainly is not al- 

 ways the case that the development of the hair 

 and that of the teeth are directly correlated ; for 

 some who are bald when cmite young have excel- 

 lent teeth, and some who have lost most of their 

 teeth while still on the right side of forty have 

 excellent hair to an advanced age. 1 



Another case, somewhat similar to that of 

 Andrian and his son, is found in a Burmese fam- 

 ily, living at Ava, and first described by Craw- 



1 Shakespeare, who was bald young (and, so far as 

 one can judge from his portraits, had a good set of 

 teeth), suggests a correlation between hairiness and 

 want of wit, which is at least likely to be regarded by 

 those who "wear his baldness while they're young" 

 as a sound theory. " Why," asks Antipholus of Syra- 

 cuse, " is Time such a niggard of hair, bein<r, as it is, 

 so plentiful an excrement?" "Because," says Dro- 

 mio of Syracuse, " it is a blessing that he bestows on 

 beasts ; and what he hath scanted men in hair he hath 

 given them in wit." 



ford in 1S29. Shwe-Maong, the head of the 

 family, was about thirty years old. His whole 

 body was covered with silky hairs, which at- 

 tained a length of nearly five inches on the 

 shoulders and spine. He had four daughters, 

 but only one of them resembled him. She was 

 living at Ava in 1855, and, according to the ac- 

 count given by a British officer who saw her 

 there, she had a son who was hairy like his 

 grandfather, Shwe-Maong. The case of this fam- 

 ily illustrates rather curiously the relation be- 

 tween the hair and teeth. For Shwe-Maong re- 

 tained his milk-teeth till he was twenty years 

 old (when he attained puberty), and they were 

 replaced by nine teeth only, five in the upper 

 and four in the lower jaw. Eight of these were 

 incisors, the ninth (in the upper jaw) being a 

 canine tooth. 



Sex-digitism, or the possession of hands and 

 feet with six digits each, has occurred in several 

 families as a sudden variation from the normal 

 formation, but after it has appeared has usually 

 be(m transmitted for several generations. In the 

 case of the Colburn family this peculiarity lasted 

 for four generations without interruption, and 

 still reappears occasionally. In a branch of a 

 well-known Scotch family, sex-digititism — after 

 continuing for three or four generations — has 

 apparently disappeared ; but it still frequently 

 happens that the edge of the hands on the side 

 of the little finger is partially deformed. 



Harelip, albinism, halting, and other peculi- 

 arities, commonly reappear for four or five gen- 

 erations, and are seldom altogether eradicated in 

 less than ten or twelve. 



The tendency to variation shown in the in- 

 troduction of these peculiarities, even though 

 they may have been eventually eradicated, is 

 worth noticing in its bearing on our views re- 

 specting the formation of new and persistent 

 varieties of the human as of other races. It 

 must be noticed that in the case of the human 

 race the conditions not only do not favor the 

 continuance of such varieties, but practically for- 

 bid their persistence. It is otherwise with some 

 varieties, at least, of domestic animals, insomuch 

 that varieties which present any noteworthy, 

 even though accidentally observed, advantage, 

 have been made practically persistent ; we say 

 practically, because there seems little reason to 

 doubt that, in every case which has hitherto been 

 observed, the normal type would eventually be 

 reverted to if special pains were not taken to 

 separate the normal from the abnormal form. 



An excellent illustration of the difference be- 



