A manual of veterinary physiology.

  • Smith, Frederick, 1857-1929.
Date:
1907
Catalogue details

Licence: Public Domain Mark

Credit: A manual of veterinary physiology. Source: Wellcome Collection.

Provider: This material has been provided by the Augustus C. Long Health Sciences Library at Columbia University and Columbia University Libraries/Information Services, through the Medical Heritage Library. The original may be consulted at the the Augustus C. Long Health Sciences Library at Columbia University and Columbia University.

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    an enzyme are present. The enzyme is invariably pepsin, but the acid is not always hydrochloric. The amount of juice secreted is uncertain, in the dog some 700 c.c. (24^ ozs.) have been collected in a few hours, from which we may perhaps imagine that a considerable amount is formed in the stomach of the larger animals. The gastric juice of the dog withstands putrefaction for a long time ; it may be kept for months without undergoing any important change; not so with herbivora; the mixed pylorus ^y^^\[\y / /oesophagus Plexus gastricuy^ \\jf ^A i Plexus gastricus anterior vagi/ ^ - Jl^ / Posterior vagi. Fig. 43.—Pawlow's Stomach Pouch (Stewart). J., £, line of incision ; C, flap for forming the stomach pouch. At the base of the flap the serous and muscular coats are preserved, and only the mucous membrane divided, so that the branches of the vagus going to the pouch are not severed. gastric fluids of the horse rapidly putrefy. The antiseptic properties of the dog's juice are attributed to its hydro- chloric acid; if this is so it is additional evidence against the acid of herbivora being hydrochloric. There appears to be no reason why lactic acid should not be formed by the marginal cells of the fundus glands, but an important source of lactic supply in herbivora is the carbohydrate of their food. Pepsin is of a proteid nature, though very little is known of it chemically. It best exhibits its action at a temperature of the interior of the body (37° to •40° C.); a low temperature