14 



a. Slight, or continuous variations. 



Variation of stature among brothers. 

 Variation of children of like parents. 

 Galton's observations on sweet peas. 



/;. Saltatory, or discontinuous variations. 

 Substantive. 

 Meristic. 

 Homoeotic. 

 Monstrosities. 

 Tumors, 



c. The correlation of variations. 



(See Darwin, Animals and Plants under Domestication, Vol. 2, 

 pp. 311-332; Brooks, Heredity, p. 157.) 



Correlation between associated parts. 

 Correlation between homologous parts. 

 Darwin's examples. 



Monstrosities. 



Varieties of pigeons. 



Galton on finger prints. 



Bateson, bilateral symmetry in variation. 



Thompson on correlation in Palaemon. 



Anomalous correlations. 



Tufts of feathers and perforations of the 

 skull. 



Color and constitutional peculiarities. 

 Symmetry in monstrosity, Bateson. 



