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44
POPULAR SCIENCE MONTHLY.
in successive stages of these the lateral pads appear at first distinct, then attached to the middle ones as a pair of lateral wings, and finally become completely fused. In the adult cushion the part furnished by each element is still traceable in the irregular contour of the resultant
![](http://upload.wikimedia.org/wikipedia/commons/thumb/9/91/PSM_V62_D050_Arrangement_of_pads_on_a_mammalian_foot.png/520px-PSM_V62_D050_Arrangement_of_pads_on_a_mammalian_foot.png)
Fig. 2. Arrangement of Pads on Mammalian Foot, (a) Typical arrangement; diagram. (b) Typical arrangement; forefoot of rat embryo, (c) Forefoot of mink, showing a slight modification of the type, (d) Forefoot of cat, showing fusion of palmar pads. Abbreviations: A, apical pads; P1-P3, palmar pads; Th, thenar pad; H, hypothenar pad; h. p, hair papilla; I-V, the digits.
mass. The noticeable projecting spur near the wrist is a modified hypothenar pad, but the small bristle-bearing papilla still farther up has nothing to do with it and is not a pad.