AS TO TUE HEllEDITY OF ACQUIRED CONDITIONS. 463 



hereditary condition. Cases of this nature have been recorded 

 by Darwin * and Micbelsont. That of Andrian Jefticbew and 

 his son Fedor {cet. 3 at the age of description), both of whom had 

 their faces covered with hair "like Skye-terviers," and were 

 nearly edentulous, is a good example %. The possibility of this 

 condition having a nervous origin Avill be discussed in a subsequent 

 section. It is probably atavistic and blastogenic. 



Gluteal Protuherances. — The excessive development of the 

 gluteal region amongst the Hottentot women and of their 

 nymphse may here be mentioned as examples of malformations 

 which have risen to the rank of racial characteristics. They are, 

 apparently, blastogenic in their nature. 



In concluding the portion of this paper relating to malfor- 

 mations by excess, the speculation may be permitted as to 

 whether there may not be many hidden abnormalities which are 

 highly hereditary yet which escape notice. Take, for example, 

 the instance of a centrale carpi. One would expect that this 

 abnormality would be hereditary, and possibly it is so ; but we 

 have no data to go upon, and in this instance it is not probable 

 that we ever shall have. In other cases, however, a little trouble 

 on the part of the observer might enable many gaps to be filled uj). 

 As an example of what I am alluding to, I may cite a curious 

 case, the only one known to me of a described hereditary abnor- 

 mality in the arterial system, though it is probably by no means 

 an isolated case, were the question to be carefully investigated §. 

 The radial artery in a male, on both sides passed over the supi- 

 nator longus at from 3"0 cm. to 4*0 cm. above the wrist, and ran 

 over the radial extensors above the styloid process to its normal 

 distribution. All this man's children possessed the same abnor- 

 mality on the left side, the daughters transmitted it better than 

 the sons, and amongst the grandchildren it was met with on both 

 sides on four, on one side only in four, and was absent in seven. 



Part 2. — Malformations hij Defect. 

 In this section the malformations by defect will be discussed, 

 and at the outset it may be said that their etiologies in many 



* ' Animals and Plants under Domestication,' vol. ii. p. 320. 

 i" " Zum Capitel der Hypertrichosis." Virchow's Arch. Bd. 100, S. 66. 

 + Lancet, 1873, ii. p. 613 ; and Vircliow, Berl. Klin. Woch. 1873, No. 29. 

 g Chicago Med. Journ. & Exam. 1879, p. 475. 



