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THE POPULAR SCIENCE MONTHLY 



tremity of the metatarsal bones, more sparsely on the back of the toes. 

 There are sti'ongly marked oblique furrows on this part of the foot, 

 especially on the joints, often combined with horny callosities, since 



Fig. 3.— The Young Male Gorilla, pbom the Specimen in the Berun Aquarium op 1876-'77. 



the animal sometimes doubles up the toes and runs upon the back 

 .of them. The nails of the hands and feet are black, like the whole 



of their skin-covering, dis- 

 tinctly grooved, very much 

 arched, and generally some- 

 what wider at the base than 

 in front. 



On the sole of the foot 

 Ave find the region of the 

 heel, the ball of the great- 

 toe, in this case resembling 

 the ball of a thumb, the 

 roots and tips of the toes, 

 together w'ith pads consist- 

 ing of muscles, tendons, and 

 skin. The several divisions 

 of these padded balls are 

 Fia. 4. — The same Animal at a still Earlier Age. sCDarated from each Other 

 by furrows which are longitudinal, oblique, and transverse, and more 

 or less distinct from each other. The black skin which covers the sole 



