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TRACINGS FROM SOLE PRINTS OF THE B- 



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TWINS 



Made in the same manner as those shown in Fig. 18. Those at the top are of the right 

 feet, and those at the bottom, the left feet of May and Mabel. "Heredity determines with 

 considerable precision the occurrence and arrangement of patterns, and other larger features 

 but the execution of them, as drawn by the ridges, is wholly individual, and is quite beyond 

 the limit of hereditary control." (Fig. 19.) 



