24 THE MENDEL JOURNAL 



diathesis and the " struggle for existence " during 

 intra-uterine life. We have also yet to learn 

 whether the people who are N N are more resisting 

 in their powers than those who are N n. For of 

 the 15-7 persons who are expected to be normal 

 in this Pedigree, only one-third will be N N in con- 

 stitution, and the rest Nn. We are not justified in 

 believing that both types will necessarily be identical 

 in resisting powers. The one may resist disease under 

 all conditions, and the other only contract it under 

 exceptionally bad conditions, leaving it to the 

 persons of n n constitution to fall victims under 

 even the best conditions, foredoomed to die of 

 tuberculosis. And, as a matter of fact. No. 6 in 

 FjL has had only a local glandular attack and is 

 now apparently quite well. Is she an ISi n ? If 

 we take her and her brother. No. 7, out of the list, 

 then we have 9 : 5 where 10 -5 : 3 -5 is expected. 



The young man No. 7 is from the modern patho- 

 logical standpoint an interesting case, or rather will 

 be, if tuberculosis declares itself in him. Can the 

 hidden weakness in his constitution be stayed by 

 an opsonic substance ? 



(3) 4 Pedigree of Human Hybrids. 

 Segregation of European Skin Colour in a Quadroon Fraternity. 



BY GEO. P. MUDGE. 



I am indebted to the courtesy of Mrs. Ilaig 

 Thomas, who very kindly passed on to me some 



