438 Duplicate Twins and Double Monsters 



No. XV. 



11. 7. 7. 5. S 10. 7. 6. 5. S 



A long seam along the hypoth- Seam, division of ridges, etc., as 



enar area and a division of the in x-\ett. 



ridges (^C?) very high up. 



11. 7. 7. 5. S 10. 7. 6. 5. S 



Seam, division of ridges, etc., as Seam, division of ridges, etc., as 



in j?-left. in x-\ett. 



[This is a very satisfactory instance of true duplicates, since there is not 

 only a complete correspondence between x and y, hand for hand, but the 

 bilateral correspondence, also, is far greater than the formulae would indicate. 

 The 10 and 6 of the right hands indicate, of course, that lines D and B 

 meet and fuse, but in the left hands this nearly happens, as in passing they 

 leave between them at the nearest place but two ridges in x and four in y. 

 In other details they correspond. I have not seen these twins, but their 

 brother states that the resemblance is exact.] 



[This finger pattern formula shows the typical nature of this case in another 

 particular, namely, the reversal of the pattern on the right index, an ulnar 

 loop on one and a radial on the other. What seems to be a lack of correspon- 

 dence in the left indices disappears when we study the actual prints, since 

 the radial loop of x encloses a large oval at its core, which is merely enlarged 

 a little in y to form the " whorl."] 



No. XVI. 

 [Used as an example of formulation at the head of this list, g. v.] 



[As these are of different sex they are known a priori to belong to the 

 fraternal class. The formulae are seen not to correspond. It may be noted 

 that y is bilaterally symmetrical in the matter of palm patterns, a condition 

 likely to occur, though not very often, in individuals not duplicate twins.] 



uuuuu uuuwu 



uuuau uuuuu 



[No correspondence here.] 



CLASSIFICATION OF THE SUBJECTS STUDIED, BASED ON THE 

 ABOVE TABULATION. 



4 



An inspection of the above will show that, relying upon the formula} 

 alone, nine out of sixteen sets, viz., I, II, III, Y, IX, XI, XII (boys 

 alone), XIV, and XV, are true duplicates, either absolutely identical 



