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 (diagram, enlarged 25 times). On the left the connective tissue fibers of the true skin are shown.

In cutis (c), or dermis, find capillaries, nerve fibers, fat cells, two sweat glands and ducts, four oil glands (two in section), two hairs, three nerve papillæ, five papillae containing capillaries, two muscles for erecting hairs. In epidermis find flat cells, round cells, and pigment cells.

(villus of intestine).

(cells with lymph spaces).

Compare with organs of man (colored Fig. 6).

j, j, jaws; ol, nerve of smell; op, nerve of sight: b, brain; t, tongue; ep, epiglottis; oe, gullet; th, thymus gland; lg, lung; h, heart; l, liver; g, stomach; s, spleen; p, pancreas; k, kidney; d, diaphragm; m, muscle; u, bladder; ch, spinal cord; v, vertebræ.