In the pre-eminently frequent event of loops with an outward slope on the middle finger, it is remarkable that the Random cases are nearly equal to the Observed ones; they are 34.08 to 35.00. It was to obtain some assurance that this equality was not due to statistical accident, that the additional set of fifty couplets were tabulated. They tell, however, the same tale, viz. 6.4 Randoms to 7.0 Observed. The loops on the fore-fingers confirm this, showing 5.18 Randoms to 5.00 Observed; those on the ring-finger have the same peculiarity, though in a slighter degree, 13 to 16: the average of other patterns shows a much greater difference than that. I am unable to account for this curious behaviour of the loops, which can hardly be due to statistical accident, in the face of so much concurrent evidence. _Twins._--The signs of heredity between brothers and sisters ought to be especially apparent between twins of the same sex, who are physiologically related in a peculiar degree and are sometimes extraordinarily alike. More rarely, they are remarkably dissimilar. The instances of only a moderate family resemblance between twins of the same sex are much less frequent than between ordinary brothers and sisters, or between twins of opposite sex. All this has been discussed in my _Human Faculty_. In order to test the truth of the expectation, I procured prints of the fore, middle, and ring-fingers of seventeen sets of twins, and compared them, with the results shown in Table XXVII. TABLE XXVII. 17 SETS OF TWINS (A and B). _Comparison between the patterns on the Fore, Middle, and Ring-fingers respectively of the Right hand._ Agreement (=), 19 cases; partial (..), 13 cases; disagreement (x), 19 cases.