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THe Retentive Faculty of the Stomach is instituted by Nature, * 1.1 as a pre∣requisite condition in reference to Concoction, which supposeth a stay of the Meat sometime in the Ventricle; that by its various ferments, the body of the Meat may be dissolved, and the alimentary Liquor drawn out, which cannot be accomplished, unless the Stomach every way embrace the aliment within its soft bosom, produced by the moderate motion of the right, oblique and circular fibres, which every way gently contracting themselves do lessen the cavity of the Stomach, and closely encircle the Meat and Drink performed by a gentle tension of the fibres, which if they be very much re∣laxed, the Stomach is rendred destitute of its retentive faculty, and the Meat slideth out of the capacity of the Ventricle, with little or no alteration.
The Tone of the Stomach is taken away, * 1.2 which proceedeth either from the current of the nervous Liquor intercepted, when the nervous fibres are ob∣structed in their first origen in the Brain, by the grossness of the succus nu∣tricius, or when the fibrils are compressed, caused by the neighboring Vessels very much extended, or their interstices much enlarged by too great a pro∣portion of exuberant Blood in an inflammation of the Coats of the Brain, or when the extremities of the fibrils are compressed by a quantity of extravasa∣ted Blood, caused by the laceration of the Vessels by great blows upon the Head, wherein the Blood being forced by an impulse out of the broken Ves∣sels, and passing through both Tables in a great fracture of the Skull, is lodg∣ed at length upon the dura mater, near the ambient parts of the Brain, com∣pressing the origen of nervous fibrils, whence the course of animal liquor is very much intercepted, so that it cannot pass into the par vagum (which im∣parteth fibres inserted into the Left Orifice and body of the Stomach, whence the nervous fibres of the ventricle are despoiled of their due tenseness, and the retentive faculty wholly lost.
Sometimes the abolished retention of the Stomach is derived from a de∣praved constitution of the animal Liquor, * 1.3 flowing from a watry mass of Blood, which vitiateth the due production of the nervous liquor in the cortical Glands, wherein the delicate parts of the Blood being depressed by watry recre∣ments in Hydropick constitutions, must necessarily propagate a dispirited animal liquor, which being imparted to the Stomacick nerves, do rob the fibres of their native tenseness, and take away the just retention of the ali∣ment.
Which is weakened onely, * 1.4 when the motion of the animal juice is not wholly stopped, but propagated in too small a proportion, so that the nerves grow lank, by reason the interstices of their filaments are not filled with nervous liquor; either because a sparing quantity of it is generated in the cortical glands, or else the free distribution of it is hindred, which is caus∣ed by the thickness of the nervous liquor, or the narrowness of the intersti∣ces, belonging to the nervous filaments, whereupon the overslow motion