228 PRINCIPLES OF STOCK-BREEDING. 



years a sound tooth, the decay having begun very 

 early in life ; she has no brothers, but there are three 

 sisters, younger than herself, whose teeth are in a 

 similar state, and in all of whom the decay commenced 

 at a very early age ; their mother was similarly affect- 

 ed in the teeth, and, like her four daughters, ' was a 

 martyr to the toothache.' 



" Of Mrs. A 's seven children, five are girls, 



in four of whom, aged respectively sixteen, twelve, 

 nine, and seven years, the teeth began to decay at the 

 age of two years or soon afterward ; in the youngest 

 girl, aged two years and a quarter, the teeth are not 

 decayed, but the dentition has been difficult. 



" Of the two boys, the third and fifth children in 

 the order of birth, one died at the age of three years, 

 and the other has attained the age of four years, with- 

 out any decay in their teeth. The father of these 

 children has sound teeth. 



" Of Mrs. A 's three sisters, the eldest has had 



four children, two boys, aged fifteen and five years, 

 with sound teeth; and two girls, aged thirteen and 

 three years, with decayed teeth. The two other sis- 

 ters of Mrs. A have no children." l 



Mr. Sedgwick reports the following case of the 

 hereditary procreation of twins by one of his female 

 patients : " The mother, the maternal aunt, the ma- 

 ternal grandmother, and the maternal great-grand- 

 mother, have all had twins, but none of the sons in 

 these families have ever been known to transmit in 

 this way a double heritage, although some of them 



1 British and Foreign Afcdico-Chirurgical Review, April, 1863, p. 

 454. 



