DEPARTMENT OF GENETICS. 

 Table 11. 



141 



A similar result is observed in group B, in which a tabulation of the 

 immediate progeny of cancerous mothers and non-cancerous fathers 

 is made. 



Finally in group C is included fraternities in which at least one can- 

 cerous individual appears. If chance alone is operative, there is no 

 reason why the sibs of such cancerous individuals should be cancerous 

 any more frequently than is the population at large. Actually, how- 

 ever, a great excess is obtained. 



From the above three lines of evidence we may conclude that there 

 exist in man one or more heredity tendencies to the formation of malignant 

 neoplasms. Further, we may state that in so far as present evidence is 

 concerned the method of inheritance follows no simple Mendelian be- 

 havior. This does not preclude the possibility that Mendelian in- 

 heritance involving multiple factors and the action of modifiers will be 

 found to apply when more suitable material is available for analysis. 



Musical Families. 



Miss Hazel M. Stanton made a quantitative study of inheritance of 

 specific musical capacities during the winter of 1919-20. She meas- 

 ured as many as possible of the members of 6 family groups having one 

 or more musical members, with respect to sense of pitch, sense of in- 

 tensity, sense of time, and tonal memory, all made quantitatively 

 by the method elaborated by Professor C. E. Seashore, of the State 

 University of Iowa. She obtained also supplementary descriptive 



