. Animal and vegetable physiology, considered with reference to natural theology. Biology; Physiology; Plant physiology; Natural theology. 140 THE VITAL valve is shown in Fig. 311, wliich represents an inner view of the cardiac portion of the stomach of the horse; o being the termination of the oesophagus. The stomach of the Water Rat is composed of two dis- tinct cavities, having a narrow passage of communication: the first cavity is lined with cuticle, and is evidently in-* tended for the maceration of the food before it is submit- ted to the agents which are to efl'ect its diges
. Animal and vegetable physiology, considered with reference to natural theology. Biology; Physiology; Plant physiology; Natural theology. 140 THE VITAL valve is shown in Fig. 311, wliich represents an inner view of the cardiac portion of the stomach of the horse; o being the termination of the oesophagus. The stomach of the Water Rat is composed of two dis- tinct cavities, having a narrow passage of communication: the first cavity is lined with cuticle, and is evidently in-* tended for the maceration of the food before it is submit- ted to the agents which are to efl'ect its digestion; a process which is completed in the se- cond cavity, provided, for that purpose, with a glandular sur- face. In proportion as nature allows of greater latitude In diet, we find her providing great complication in the digestive appara- tus, and subdividing the stomach into a greater numijer of ca- vities, each having probably a separate office assigned to it, thougli concurring in one general effect. A gradation in this respect mf»y be traced through a long line of quadrupeds, such as the Hog, the Peccari, the Porcupine, (Fig. 308,) and the Hippopotamus, where we find the number of separate pouches for digestion amounting to four or five. Next to these we may rank tlie very irregular stomach of the Kan- gnroo, (Fig. 309) composed of a multitude of cells, in which the food probably goes through several preparatory processes: and still greater complication is exhibited by the stomachs of the Cctacea, as, for example, in that of the Porpus (Fig. 310.) As the fishes upon which this animal feeds are swal- lowed wliole, and have large sharp bones, which would injure any surface not defended by cuticle, receptacles are provided, in which they may be softened and dissolved, and even con- verted into nourishment, by themselves, and without inter- fering with the di;rrstion of the soft parts. The narrow com-. Please note that these images are extracted from scanned page images that
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