. A dictionary of birds . Fig. 1. Fig. 2. Fig. 1.—Diagram of an Intestinal Villus with the Central Absorbent, Ramified its duct; A and v, Artery and vein ascending in Sm. the submucous layer ; E. Cylindricalcells of the epithelium of the mucous layer, which at forms a Lieberkiihn gland; Lg. andAn. Longitudinal and annular or circular muscular fibres ; .Sc Serosa or outer layer of connectivetissue, together with the investing peritoneal lamella Pe., which forms tlie mesentery il/. in Fig. 2. Fio. 2.—Diagram of a Transverse Section through the Villi; M. Mesentery wit

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. A dictionary of birds . Fig. 1. Fig. 2. Fig. 1.—Diagram of an Intestinal Villus with the Central Absorbent, Ramified its duct; A and v, Artery and vein ascending in Sm. the submucous layer ; E. Cylindricalcells of the epithelium of the mucous layer, which at forms a Lieberkiihn gland; Lg. andAn. Longitudinal and annular or circular muscular fibres ; .Sc Serosa or outer layer of connectivetissue, together with the investing peritoneal lamella Pe., which forms tlie mesentery il/. in Fig. 2. Fio. 2.—Diagram of a Transverse Section through the Villi; M. Mesentery with blood- and lymphatic vessels. The capacity of the Intestinal Canal depends upon the natureof the birds food. In order to compare its length in differentforms we require a unit by which to arrive at its relative propor-tions. The length of the whole vertebral column, or even the dis-tance from the tip of the bill to that of the tail, has beenfrequently used; but this gives only faulty results, since thelength of the

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Keywords: ., bookauthorlyde, bookcentury1800, bookdecade1890, booksubjectbirds