. Carnegie Institution of Washington publication. 48 A NEW TYPE OF BRACHYPHALANGY IN MAN. taken in its old uncritical sense. But the author has trusted in second- hand information and also characterized as "not brachyphalangous" several members of the family, in which the character manifests itself under another somatic type, "doigt crochu" (cf. p. 12). A case so extreme as that of 9 S. G., discussed above, might be comparatively rare. But the frequent occurrence of very slight shortening of the affected phalanx in the heterozygous individuals in our material makes i
. Carnegie Institution of Washington publication. 48 A NEW TYPE OF BRACHYPHALANGY IN MAN. taken in its old uncritical sense. But the author has trusted in second- hand information and also characterized as "not brachyphalangous" several members of the family, in which the character manifests itself under another somatic type, "doigt crochu" (cf. p. 12). A case so extreme as that of 9 S. G., discussed above, might be comparatively rare. But the frequent occurrence of very slight shortening of the affected phalanx in the heterozygous individuals in our material makes it clear how absolutely insufficient and misleading second-hand information is in heredity work in man. We are here dealing with a malformation, in many individuals better defined, simpler, and therefore more easily controlled than most of the hereditary characters hitherto studied in human material. Here, if anywhere, it might a priori seem probable that inquiries directed to the family members would furnish a trustworthy basis for the study of the heredity of the malformation. Yet such a method of investiga- tion would have led to entirely false results. In fact, almost none of the B-type individuals would have been recorded, though they are as numerous as the B !-type ones. A pedigree of the descendants of G? C. A. B. H. as it would have looked if based on the information obtained from family members and examination only of the reported brachyphalangous ones, is given in text-figure 2 as an —cf cf cf REPORTED TO BE NORMAL REPORTED TO BE BRACHYPHALANGOUS TEXT-FIGURE 2. — Pedigree of the descendants of c? constructed on basis of information obtained by the members of the family. The quite unsatisfactory nature of the material upon which Rabaud principally founds his criticism is obvious in the light of such a pedi- gree. When a personal examination of all family members has shown the complete inadequacy of the "second-hand" method of colle
Size: 1602px × 1560px
Photo credit: © Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorcarnegie, bookcentury1900, bookdecade1900, bookyear1902
