RESULTS OF FAMILY HISTORY STUDY 



427 



age weight for each family is given. Note family No. 4 in which the 

 average weight of 5 children was 11.3 pounds. Family No. 3 likewise 

 has very heavy children at birth, inasmuch as these 7 children averaged 9 

 pounds each. The value of these data lies in the fact that average birth- 

 weight of brothers and sisters is given in addition to the more common 

 weighted average for all the individuals. This weighted average is of more 

 interest, however, than those generally found, since all of these 48 individ- 

 uals are from a homogenous stock. 



The inheritance of various traits is shown in a series of pedigree studies. 

 (See fig. 1.) First, one pertaining to the inheritance of eye color. The eye 

 color was determined by comparison with Martin's Augenfarbentafel. The 



TABLE 3 



pedigree bears out the iact that children of blue-eyed parents generally have 

 blue eyes, and children of dark-eyed parents have, as a rule, dark eyes. If 

 one parent is heterozygous for dark eyes and the other parent has blue eyes, 

 of the offspring some may have blue eyes and some brown eyes. This study 

 was published in the Eugenical News, vol. 15, 1930, p. 175. 



In the pedigree in figure 2 is shown a family in which a definite bronchial 

 weakness exists. Note that individual I 2 suffered often from bronchitis. 

 Two of her children are troubled in a similar manner (II 3 and II 6 ) ; one (Hi) 

 has asthma and the fourth (II 7 ) is normal. Two of the descendants of Hi 

 have asthma, the oldest was always in poor health because of it and died 

 from pneumonia, after a long siege of asthma. Sensitivity to grain dust and 



