The Causes that hinder Concoction in the Stomach may be brought into three Heads, namely, a fault in the Organ, Object, and things External and Internal.
The fault in the Organ comprehendeth all diseases in the Stomach, whether they be Similar, or Organ cal, or Common, all which may overthrow its actions, but distemper is commonly the cause of hurt Concoction; for since Concoction is made by a moderate heat according to Nature, if at any time it want its due moderation, the Concoction is hurt. So a cold distemper of the Stomach which diminisheth the Heat, if it be gentle it only weakeneth the Concoction, and make a Brylypepsia, or slow Concoction. If the cold distemper be greater, it abolisheth Concoction, and makes Apepsia. But a hot distemper doth deprave Concoction, and make a Dyspepsia, which is a difficult Concocti∣on. These distempers are somtimes simple, and in such who have Naturally a weak Stomach, and smal Natural heat; or have a sharp and burning heat, but they are commonly with matter: hence in Hypochondriack Melancholly, much flegm and fermentation of a black Humor use to cause Cru∣dities, Winds, Swellings, Rumblings, and sowr Belchings.
The fault of the Object, that is, the nourishment which is the proper Object of the Stomach, comes many waies, when it offendeth in Substance, Quantity, Quality, time, or Order of being taken.
Nourishment is vitious in respect of its substance, when it is too hard and difficult to be concocted, as Deers flesh, Hairs flesh, especially if old, and made hard with Salt or Smoak, Bread full of Bran, Mushroms, Roots, Pulse, and the like, which are called Dyspepta.
Meats offend in Quantity when too much is taken at once, and therefore cannot be overcome by the heat, hence come Crudities, which are most usual among them who do surfet themselves. If there be less eaten than is required, it may seem to be crude, because too little meat will be burnt and dryed in a Chollerick Stomach.
Meats offend in Quality which are too cold and moist, and windy, or they which are too hot, whereby the thinner part of the Chyle is burnt, and turned into nidorous vapors.
To this may be reduced the Art of Cookery, and Sawce-making; for the divers waies of roasting, boyling, and making of Sawce, do alter the disposition of Meat, by which means they be∣come more easie or hard of Concoction.
The time and order of eating being preposterous, may also spoil the Concoction, as if any one should omit his usual time of eating, and fall to at midnight, or a little before he goes to sleep, fill his Stomach; or if after taking of solid and astringing things, as Cheese, Pears, Quinces, and the like, they take liquid things which do soon corrupt.
Also external things may spoil the Concoction, if they be immoderate: so too cold Air by dulling the natural near, if it be weak or too hot, by dissipating the heat may hinder Concoction; as also im∣moderate exercise, especially after meat, by drawing the natural heat forth from the Stomach to the external parts, and so dispersing it extraordinarily; as also by throwing the Chylus yet imperfect into the Guts. The stoppage of the Belly and other excrements, or an immoderate flux, great wat∣chings, sleep in the day time, great passions of the mind, especialy sadness, and deep study presently after meat, and the like, do not a little hinder the action of the Stomach.
Besides the Causes mentioned, the Hermeticks of late time mention one less usual, and not noted by the Ancients, which also is not plainly demonstrated by them; but it is confirmed by some con∣jectures, not to be contemned; of which we made mention in the explaining of the Causes of Fames Canina. First therefore they ashrm that the Natural Concoction of the Stomach is not made by heat only; but that quick melting of solid meats by which it is converted into Chylus, is from another cause; since Experience teacheth that meat boyling in a pot at a strong fire many daies, will never be dissolved: and bones in a Dogs Stomach are quickly dissolved, and turned into Chylous Liquor; and in the bellies of Fishes which have no actual heat, all that is brought in is dissolved and concocted the same way. Therefore they lay down the principal Cause of this dissolving to be a certain Spirit or sharp Liquor sent from the Spleen into the Stomach, which hath great power to dissolve. And they take this opinion from Galen, by whom it is confirmed that a Melanchollick Humor sent from the Spleen into the Stomach, doth cause appetite, and that either by astringing or wrinkling the inner Tunicle of the Stomach, or pulling of it by its sharpness, which may be opposed; for if it do it by a∣striction, then all astringent things would do the same; and if by pulling, sharp things rather than sowr would provoke Appetite. Therefore they think it more probable, that that humor should stir up Appetite by accident, by causing want of nourishment, by dissolving of that which comes in. And therefore they allow a more noble use of the Spleen than ever the Ancients thought of, namely, to be a chief instrument to serve the Stomach in Concoction: This may be conjectured from Birds which dissolve the hardest seeds, and have a Spleen round about their Stomach or Maw, that it may more po∣werfully inspire that dissolving Spirit, or communicate unto it sowr Liquor. And Helmont from his own experience saith, that that sowr Spirit is very strong in Birds; for he relates that when he was a Boy and kept a Sparrow, he gave it his Tongue, which the Sparrow catching with his Bill disired to