10 Eugenics Record Office, Bulletin. 



to be studied, in that this mating produced the fraternity just de- 

 scribed. The father, described as feeble-minded, should form the 

 basis of an extended study. It is noted that his parents died at an 

 old age but nothing further is known of either of them. If possible, 

 they should be proven to be either normal or nervously affected. 

 If normal, then it will be a profitable expenditure of time to search 

 the ancestry and complete fraternities of each for affected individuals, 

 in order thoroughly to test the hypothesis in this mating. Likewise 

 the mating I — 1 and 2 should be studied with a view to determining 

 the nature of I — 2 ; it is apparent that if I — 2 is normal all of his 

 five children should also be normal, and if they were so it would not 

 be profitable to spend very much time in tracing further his blood. 

 The fraternities II — 1 to 5 and II — 6 to 12 should be more thoroughly 

 studied in that a detailed knowledge of each will throw light on the 

 nature of the germ plasm producing II — 5 and 6. More should also 

 be known concerning the consort of II — 7 and her "blood," inasmuch 

 as this mating was productive of abnormal offspring. The other 

 consorts of the II generation are not so important, if on investigation 

 the offspring prove all to be normal. Likewise the consorts of III are 

 not so important because their children are all very young; however, 

 for study a few years hence it would be highly desirable to have these 

 persons accurately described, and such description should be made if 

 the requisite information can be secured without too great an expendi- 

 ture of time. 



In this pedigree the field worker has charted the males to the 

 right and the females to the left; this should be reversed for 'the 

 sake of uniformity of practice. Indicate the year of birth on the 

 pedigree only in the case of young children. This pedigree contains 

 few persons marked (N), normal. It is highly desirable that every 

 person studied should be so thoroughly described that he or she can 

 either be safely marked (N) or given a proper mark designating the 

 type of abnormality possessed. 



