. Animal and vegetable physiology, considered with reference to natural theology, by Peter Mark Roget ... Biology; Physiology; Plant physiology; Natural theology. 192 THE VITAL spiral fold of the inner, or cuticular membrane, which forms a complete valve, offering no impe- diment to the entrance of food from the oeso- phagus, but obstruct- ing the return of any part of the contents of the stomach into that passage.* This valve is shown in Fig. 311, which represents an inner view of the car- diac portion of the sto- mach of the horse; o being the termination of the oesophagus. The s
. Animal and vegetable physiology, considered with reference to natural theology, by Peter Mark Roget ... Biology; Physiology; Plant physiology; Natural theology. 192 THE VITAL spiral fold of the inner, or cuticular membrane, which forms a complete valve, offering no impe- diment to the entrance of food from the oeso- phagus, but obstruct- ing the return of any part of the contents of the stomach into that passage.* This valve is shown in Fig. 311, which represents an inner view of the car- diac portion of the sto- mach of the horse; o being the termination of the oesophagus. The stomach of the Water Rat is composed of two distinct cavities, having a narrow passage of communication : the first cavity is lined ^ith cuticle, and is evidently intended for the mace- ration of the food before it is submitted to the agents which are to effect its digestion ; a process which is completed in the second cavity, pro- vided, for that purpose, with a glandular surface. In proportion as nature allows of greater lati- tude in diet, we find her providing greater com- plication in the digestive apparatus, and subdi- viding the stomach into a greater number of * The total inability of a horse to vomit is probably a conse- quence of the impediment presented by this valve. See Mem. du Museum d'Hist. Nat. viii. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Roget, Peter Mark, 1779-1869. London : W. Pickering
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