The laws and mechanics of circulation, with the principle involved in animal movement . Lieberkiihnian fol-licles form a circle around them ; are more numerous in thelower portions of the ileum, while they vary from twenty tothirty, and even more, in number, becoming less and less,however, as age advances. The usual number of follicles ina patch is from twenty to thirty, but they vary from as lowas three to seven, while the large patches may contain fromfifty to sixty (Prey). The following illustration will show thecharacter of the mucous membrane in the large intestine, andthe relations it su
The laws and mechanics of circulation, with the principle involved in animal movement . Lieberkiihnian fol-licles form a circle around them ; are more numerous in thelower portions of the ileum, while they vary from twenty tothirty, and even more, in number, becoming less and less,however, as age advances. The usual number of follicles ina patch is from twenty to thirty, but they vary from as lowas three to seven, while the large patches may contain fromfifty to sixty (Prey). The following illustration will show thecharacter of the mucous membrane in the large intestine, andthe relations it sustains to the circular muscles (Fig. 7). PHYSIOLOGICAL ANATOMY. 213 The crypts of Lieberkulm continue, but the villi extend nofurther than the free border of the ileo-csecal valve. It pre-sents the same structure and arrangement of its constituentparts as the small intestine, of which it is a direct continua-tion. Now, then, the point to which attention is speciallydirected concerns the action in the muscular cylinder in whichthe mucous membrane is placed. From the nature of these z. Fig. 77.—A Longitudinal Section of the Small Intestine of a Rabbit, through a PeyersPatch (S).—Verson. Z, Z, villi ; J, follicles of Lieberkuhn ; K, cap of a gland ; m,muscalaris mucosae ; C, C, submucosa ; S, glands of Peyer ; B, circular muscles ; L,longitudinal muscles ; P, peritoneum. anatomical dispositions in the mucous membrane, and the me-chanical adjustments that obtain in the intestine, it followsthat contraction in the muscles must have the effect of forciblycompressing the gland follicles and lymphoid follicles (), and compelling the secretions out of them, gently buteffectually constringing them, and milking them, so to speak, 214 PHYSIOLOGICAL ANATOMY. of their contents by means of the uniform compression ex-erted through the elastic air-cushion under the energy in themuscles. Sandwiched as they are between these forces, with the mus-cles as the firm floor of support, th
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