1. That hunger is the effect of distention of the vessels that secrete the gastric juice.
2. That the processes of mastication, insalivation, and deglutition, in an abstract point of view, do not in any way affect the digestion of the food; or, in other words, when food is introduced directly into the stomach in a finely divided state, without these previous steps, it is as readily and as perfectly digested as when they have been taken.
3. That saliva does not possess the properties of an alimentary solvent.
4. That the agent of chymification is the gastric juice.
5. That the pure gastric juice is fluid, clear and transparent; without odour; a little salt; and perceptibly acid.
6. That it contains free muriatic acid, and some other active chemical principles.
7. That it is never found free in the gastric cavity; but is always excited to discharge itself by the introduction of food or other irritants.
8. That it is secreted from vessels distinct from the mucous follicles.
9. That it is seldom obtained pure, but is generally mixed with mucus, and sometimes with saliva. When pure it is capable of being kept for months, and perhaps for years.
10. That it coagulates albumen, and afterwards dissolves the coagulæ.