460 Duplicate Twins and Double Monsters 



the soft parts than in those dependent npon the skeletal parts. Even here, 

 however, there is some difference, as in the standing height, which dif- 

 fers respectively by 14, 15, 1 and 6 mm. The difference in breadth of 

 head in No. YI is of interest, since the skull would be but little affected 

 by environment, and it would be a matter of great interest if we could 

 have the breadth in the other cases and the length in all, that a compari- 

 son might be made of the cephalic indices. The marked difference in 

 chest girth in No. VI would seem to point to a differing degree of 

 interest in athletic sports possessed by these young men, but the differ- 

 ence in this item appears to be considerable in the other cases also, and 

 is correlated with a variation in the breadth of shoulders save in I, 

 in which the difference is on the wrong side. Unexpected differences 

 are found in such items as the length of feet and the length of cubitus 

 (left and right elbow tips) in No. VI, since they are based on skeletal 

 parts. The variations in girth are more to be expected, as they are 

 easily influenced by varying causes, such as amount of exercise, condi- 

 tion of the digestive organs, etc. 



SUMMARY. 



As this paper has drawn so largely on previous work and, in the ex- 

 position of its theories, makes use of so many facts and principles that 

 are already well known, an attempt will be made here to separate these 

 from the immediate results of the present investigation, and to that 

 end I will divide this summary into two parts, in the first of which, 

 headed " Eesults," I will state the essential points of my own investiga- 

 tions, and will follow this by the " Conclusions," in which I will attempt 

 a condensed statement of the theories held by this paper, without refer- 

 ence to the sources from which the material has been derived. It should 

 be emphasized that the " Conclusions " cited here are not stated as facts 

 already proven, but as the various parts of a working hypothesis seem- 

 ingly consistent with the facts so far as known at present, and intended 

 to suggest farther speculations in this field. 



I. RESULTS. 



1. My material has been derived from sixteen sets of twins and two 

 sets of triplets, and includes: 



a. Complete palm and sole prints of one set of triplets. 



b. Complete palm and sole prints of six sets of twins. 



c. Palm prints of nine other sets of twins. 



d. Eolled finger prints of seven of the sets of twins; dabbed finger 

 prints of the remainder. 



