Observations on certain parts of the animal oeconomy . any connexion with it, and ob-ferving that the half-diffolved parts of the ftomach were fimilar to thehalf-digefted food, it immediately ftruck me, that it was the procefs ofdigeftion going on after death; and that the ftomach, being dead, was nolonger capable of refifting the powers of that menftruum, which itfelf hadformed for the digeilion of food. Thefe appearances of the ftomach after death, throw conliderable lighton the principles of digeftion, and fhow, that it neither depends on a me-chanical power, nor contractions of the ftomach
Observations on certain parts of the animal oeconomy . any connexion with it, and ob-ferving that the half-diffolved parts of the ftomach were fimilar to thehalf-digefted food, it immediately ftruck me, that it was the procefs ofdigeftion going on after death; and that the ftomach, being dead, was nolonger capable of refifting the powers of that menftruum, which itfelf hadformed for the digeilion of food. Thefe appearances of the ftomach after death, throw conliderable lighton the principles of digeftion, and fhow, that it neither depends on a me-chanical power, nor contractions of the ftomach, nor on heat, but fome-thing fecreted in the coats of the ftomach, and thrown into its cavity,which there animalifes the food, or affimilates it to the nature of theblood. The power of the gaftric juice is confined or limited to certainfubftances, generally of the vegetable and animal kingdoms; and althoughthis menftruum is capable of adting independently of the ftomach, yet itis indebted to that vifcus for its exiftence and continuance. T/a/-c XIV. Ji:yA,u-,^^-/. 0/if/a-//:on--J<ii//i [ 233 ] PLATE XIV. A portion of inteftine of a hog, the peritoneal coat of which Is coveredin feveral places with fmall pellucid cyfts, containing air. It was fent to me by my friend Mr. Jenntr, furgeon at Berkley, whoinformed me, that this appearance is found very frequently upon the in-teftines of hogs that are killed in the fummcr months. A The portion of the mefentery. B The portion of inteftine on which the air-cells are iituated. Hh [ 235 ] ON A SECRETION IN THE CROP OF BREEDINGPIGEONS, FOR THE NOURISHMENT OF THEIRYOUNG. THE nourishment of animals admits, perhaps, of as much varietyin the mode by which it is to be performed, as any circumftanceconneded with their CEConoijiy; whether we confider their numeroustribes, the different ftages through which every animal palTes, or the foodadapted to the fupport of each, in their diftincl conditions and are likewife to include in
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