348 



The Journal of Heredity 



ure the relationship between animals 

 in such a way that direct comparison 

 can 1)6 made with ]\IendeHan theory, 

 the most satisfactory method seems to 

 be to find the coefficient of correlation 

 to be expected with respect to a char- 

 acter determined wholly by heredity 

 with no dominance. Such conditions 

 ffive the maximum correlation and an^• 



other conditions give results strictly 

 proportional. The correlation between 

 parent and offspring or between full 

 brothers should be 0.50 in such cases, 

 according to Mendelian theory, in close 

 agreement with many actual determina- 

 tions. The correlation to be expected 

 when the relationship is more complex 

 can readily be calculated.". 



Literature Cited 



^ The statements in regard to the early history of the Shorthorn cattle are largely 

 drawn from Shorthorn Cattle by Alvin H. Sanders and Fann Lk'cstock of Great Britain 

 by Robert Wallace. 



^KiNG, Helen Dean, 1919. Studies on Inbreeding. The Wisner Institute of Anatomy 

 and Biology, 175 pages. Reprinted from the Journal of Experimental Zoology. 26:1-98; 

 27:1-35, and 29:134-135. 



^Wright, S., 1922. The Efifects of Inbreeding and Crossbreeding on Guinea Pigs. 

 Bulletins 1090 and 1121. U. S. Department of Agriculture. 



^Wright, S., 1922. Coefficients of Inbreeding and Relationship, .lineriean Xatitralist, 

 56:330-338. 



"Wright, S., 1921. Systems of Mating. Genetics, 6:111-178. 



" Pe.arl, R., 1917. Studies on Inbreeding. American Naturalist, 51:545-559; 51:636-639. 



MENDEL "COMES BACK" 



Scheduled to Attend World Dairy Congress with McCulIum and Other World 

 Famous Specialists in Dairy Science 



There is to be a world dairy con- 

 gress in Washington October 3 and 3. 

 adjourned to Philadelphia for October 

 4. and to Syracuse, N. Y., October 

 5 to 10. This congress will be attended 

 by the world's most famous specialists 

 in dairy science. 



There will be delegates here from 

 practically every country of Europe, 

 South America and Australia. Most 

 of them will be men of national repu- 

 tation, and many of international fame. 

 There will be leaders in science, includ- 



ing ]\Iendel. who discovered the as- 

 tounding law of breeding and cross- 

 breeding, and McCollum, who discov- 

 ered the most revolutionary element of 

 nutrition, known as "vitamins," with- 

 out whose presence in food all nutri- 

 tion is valueless and leads only to 

 disease and death. Vitamins were un- 

 known prior to 1912 ; today physicians 

 and dieticians who are not informed as 

 to their essential activities are not com- 

 ])etent to practice medicine or prepare 

 fi;)od. — IVasIiiiu/toi! Star. 



