A THEOEY OF HEREDITY. 219 



others either phj'sicallj' or mentally. The above observations are sug- 

 gestive, not final. 



To summarize the feminine types, it may be said that the height, 

 weight, chest girth and head size are less for the girls than for the boys, 

 while the class standing and the cephalic index are greater. The 

 feminine types correspond fairly well to the masculine ones of the same 

 kind, with minor differences. 



The fact that the same t3rpes can be collected from a hundred girls 

 as from a thousand boys, in nearly the same relative proportion as to 

 number and with similar physical differences, speaks well for the types 

 selected as representing realities. Head size, particularly frontal width 

 and class standing, are correlated, but cephalic index and class standing 

 show no correlation. 



There is a slight indication that the girls may l)e more nearly lil^e 

 the aboriginal types than the boys, because the blonde girls are fairer 

 and the brunette girls are darker; the height of the girls is relatively 

 nearer that of the primitive types than is the height of the boys; the 

 chest girth of the girls is also closer to the original. The cephalic index, 

 head length and width, places the long-headed girls relatively nearer to 

 dolichocephaly than the long-headed boys, and the broad-headed girls 

 are decidedly more brachycephalic than the broad-headed boys. 

 . The head shape of the girls is shorter, broader and higher, with prom- 

 inent frontal and occipital regions, due partly to small brow ridges 

 and small occipital protuberances. This gives a square, vertical forehead 

 similar to those of the Iberian boys, the shape of which is due to the 

 same factors. 



TYPE HEREDITY. 



A tentative scheme of heredity, or of the processes that are transform- 

 ing the physical characters of man, is formulated for the first time in 

 this paper, in order to throw light upon the existing types of the white 

 people and to assist in tracing their origins, as well as to determine 

 some of the forces at work in shaping the formation of new types. The 

 scheme embodies the principles of determinate variation, alternate varia- 

 tion and discontinuous variation, and applies these principles in a 

 practical way to explain type heredity in man. It is briefly as follows: 



An original germ plasm contained all ( ?) the possibilities of life. 

 Certain innate tendencies influenced by surrounding conditions caused 

 variations from time to time (determinate variation) until a type became 

 too differentiated and specialized (evolution) to exist, and perished 

 (paleontology). The germ plasm persisted. Man is at present one of 

 the diiferentiated and specialized living forms. Types of man have 

 been produced favorable to the surrounding conditions (isolation), and 

 the crossing of these types blends definite characters and again disen- 

 gages them, each of the blended characters returning, more or less pure, 

 in succeeding generations (alternate variation). After characters be- 



