FAMILY RECORD. 33 



Fourth Family of V Generation. 



The B-type brachyphalangous 115.1 9 E. G. H. had, by her mar- 

 riage with 0. G., 3 children, 1151.1-1151.3. 



1151.1 cf E. G. (Aug. 18, 1873-Apr. 4, 1902), technician. All the 

 information is to the effect that he had normal hands, a statement 

 that is confirmed by a photograph of his right hand. 



1151.2 9 S. G. (b. July 16, 1876). All inqumes about her hands 

 resulted in the statement that they were normal. This will easily be 

 understood when looking at the photograph (fig. 13), showing the 

 hands seen from the back. Aside from the missing of the right fourth 

 finger^ lost in an automobile accident, the hands on superficial examina- 

 tion heem. to be perfectly normal. From the volar side it is seen, 

 however (fig. 14), that the distance between the two distal grooves on 

 the indices, compared with the corresponding distance on the fourth 

 fingers, is a little shorter than is the case in a normal hand. The 

 radiographs (fig. 43) permit an exact measurement of the phalanges. 

 II 2 on the right hand is 21 mm. On the left the lengths of II 2 and 

 IV 2 are 20 and 26 mm. respectively. 



It will be seen later, when we analyze the correlation between the 

 lengths of these two phalanges in normal hands, that Pfitzner (1892, 

 1893), among 301 normal hands, has in one case found the same 

 measures, 20 and 26 mm. Judged from this character, our individual 

 might therefore be regarded as normal. The aspect of the inside of the 

 indices, however, indicates that we here are dealing with a very extreme 

 case of the B-type brachyphalangy. This view is supported by the 

 fact that the individual is genetically heterozygous for the factor for 

 brachyphalangy. She has a son, to be mentioned later, who shows the 

 B !-type of the brachyphalangous condition, 11512.1 cf (pp. 36-37). 



The case illustrates the necessity of making extremely careful exami- 

 nations in dealing with human material. Even where the inherited 

 factor, when heterozygous, calls forth so striking alterations as in this 

 case of brachyphalangy, we can still find cases where the heterozygous 

 individuals, even after a careful examination, might be regarded as 

 somatically normal. 



1151.2 9 S. G married the unrelated factory owner 0. S. R. (b. 

 July 16, 1865). She has 1 son, 11512.1 cf (pp. 36-37). 



1151.3 0?" S. G. (b. Apr. 29, 1882), civil engineer. Photographs and 

 radiographs of his hands show that he is free from brachyphalangy. 

 Lengths of II 2 and IV 2 are 25 and 30 mm. on the right, 25 and 29 

 mm. on the left hand. He married the unrelated J. A. (b. July 29, 

 1888) and has 1 daughter, 11513.1 9 (p. 37). 



Investigations as to this family show that the brachyphalangous 

 115.1 9 E. G. H. had two normal and 1 B-type brachjnphalangous 

 children. This proves that 115.1 9 herself was heterozygous for the 

 factor for brachyphalangy (cf. p. 28). 



