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OCR Rendition - approximate
viii PECULIARITIES OF THE DIGITS 123 thumb and the fore-finger of either hand, and to those couplets exclusively, the A causes ; those that are common to the two thumbs and to these exclusively, the B causes ; and similarly those common to the two fore-fingers exclusively, the C causes. Then the sum of the variable causes determining the class of pattern in the four several digits now in question are these Right thumb A + B + an unclassed residue called X(1) Left thumb A + B + Right fore-finger A + C + Left fore-finger A + C +  X(2) Z(1) Z (2) The nearness of relationship between the two thumbs is sufficiently indicated by a fraction that expresses the proportion between all the causes common to the two thumbs exclusively, and the totality of the causes by which the A. L. W. class of the patterns of the thumbs is determined, that is to say, by Similarly, the nearness of the relationship between the two fore-fingers by A+C (2). A+C+Z(1) +Z . (2) And that between a thumb and a fore-finger by A (3). A + B + C + X(1) (or X(2)) + Z(1) (or Z(2)) The fractions (1) and (2) being both greater than (3), it follows that the relationships between the two thumbs, or between the two fore-fingers, are closer . . (1). A + B +X(1) + X(2) A+B
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