Miscellanea 
429 
c/xf 
Ax 
IT. 
I. 
II. 
I. 
II. 
I. 
II. 
a; ' 
I 
f x * 
I 
A, r 1 -| 
I 
A | - 1 -, 
I I 
ttf vf 
I have also 
I. 
II. 
of x ? 
i 
A r L - 
A 
A 
d/X ? 
X £ 
? x oj 
A 
Fig. II. 
? x a? 
I 
C r ' 
i 
I 
Of 
f Xof 
demonstrated by such use. I have in my possession several pedigrees illustrating the result 
of crossing pure Jew with pure Gentile. These give 
£ x ? 
I 
I 
? x 4 
A'. 
& ? ? 
O = Distinctly Jewish. 
©=Pure Gentile birth. 
0 = Intermediate appearance. 
Fig. III. 
In each case the cross of a distinctly Jewish type with a no less distinctly Gentile type 
produces offspring either of Jewish or of intermediate appearance. It is, in fact, characteristic 
of the application of Meudelism to problems such as these, that imperfect categories and 
incomplete analysis should superficially render soluble a problem which, on a more intimate 
dissection, does not yield its secret to the Mendelian enthusiast. 
In fact, this problem, as every genetic problem, is to be solved only by the method of 
quantitative analysis, that is, by the methods of biometry. We must know the numerical 
distribution of the various types of Jew in a population sufficiently random in character to 
