Xo. ")3(iJ 



COLOR INHERITANCE 



453 



Watts; 95 per cent, alcohol fixation; color— yellow, 5 

 per cent. ; white, 7 per cent. ; red, 19 per cent. ; black, 69 

 per cent. (Fig. 1). 



15. Pure negro; abdominal operation by Dr. S. II. 

 Watts ; 95 per cent, alcohol fixation; slightlv lighter than 

 No. 14. 



16. Brunet ; abdominal operation by Dr. S. H. Watts ; 

 95 per cent, alcohol fixation. 



17. Mulatto; abdominal operation by Dr. S. H. Watts; 

 95 per cent, alcohol fixation ; color — yellow, 14 per cent. ; 

 white, 14 per cent. ; red, 35 per cent. ; black, 37 per cent. 



18. Mulatto ; abdominal operation by Dr. S. H. Watts ; 

 95 per cent, alcohol fixation ; a shade lighter than No. 17. 



Ranged according to degree of coloration, judged 

 macroscopically, the 17 pieces of skin (omitting No. 6) 

 take the following order: 



Negro 9, 14 (B, 69), 1 (B, 66), 2, 15. 



Mulatto 4, 3 (B, 50), 8 (B, 43), 17 (B, 37). 10, 18. 



Brunet 7, 11, 12, 16, Blond 13, 5. 



This list could have been enlarged indefinitely, but 

 more material was not deemed requisite to the demands 

 of this studv. Number 6 took rank between numbers 

 18 and 7. 



Sources of Epidermal Pigment.— There are obviously 

 three distinct views which might be held— and as a mat- 

 ter of fact have been held — in regard to the origin of the 

 pigment of the skin: (1) In the epithelial cells of epi- 

 dermis; (2) in the connective tissue cells of the dermis, 

 and secondarily transferred to the cells of the rete 

 mucosum Malpighi; (3) in both the epithelial and con- 

 nective tissue cells. The second view more especially 

 further involves the question as to whether the pigment 

 arises in the connective tissue cells as a result of cellular 

 (secretory) activity or whether the cell extracts the pig- 

 ment (fully formed or unsynthesized) from the blood; 

 also the manner of the transference of the pigment to 

 the epithelial cell. 



There are two works which bear upon this point more 

 directly: (1) That of Karg (1888) who ably supports the 

 second view on the basis of findings from a microscopic 



