. 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 5m. the submucous layer ; Fj. Cylindricalcells of til e epitlieliuiii of tlie mucous layer, which at forms a Lieberkuhn gland; Lg. andAn. Longitudinal ami annular or circular muscular fibres ; ,se. Serosa or outer layer of connective A. .,tissue, together with the investing peritoneal lamella Pc, which forms the mesentery J/, in Fig. 2. jir^-r-<^ Fig. 2.—Diagram of a Transverse Section through the

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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 5m. the submucous layer ; Fj. Cylindricalcells of til e epitlieliuiii of tlie mucous layer, which at forms a Lieberkuhn gland; Lg. andAn. Longitudinal ami annular or circular muscular fibres ; ,se. Serosa or outer layer of connective A. .,tissue, together with the investing peritoneal lamella Pc, which forms the mesentery J/, in Fig. 2. jir^-r-<^ Fig. 2.—Diagram of a Transverse Section through the Villi; jl/. Mesentery with blood- and lymphatic vessels. C0 7 ^ /^f 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

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Keywords: ., bookauthorlyde, bookcentury1800, bookdecade1890, booksubjectbirds