The elements of medical chemistry : embracing only those branches of chemical science which are calculated to illustrate or explain the different objects of medicine, and to furnish a chemical grammar to the author's Pharmacologia . he presence of some leaven to enableit to undergo that process. In the native juices of fruits, aswell a? in imperfectly refined sugar, such a principle exists,whence the addition of a ferment or leaven, is not essential fortheir fermentation. Considerable obscurity still exists withrespect to the nature and composition of this fermentingprinciple, but late experim
The elements of medical chemistry : embracing only those branches of chemical science which are calculated to illustrate or explain the different objects of medicine, and to furnish a chemical grammar to the author's Pharmacologia . he presence of some leaven to enableit to undergo that process. In the native juices of fruits, aswell a? in imperfectly refined sugar, such a principle exists,whence the addition of a ferment or leaven, is not essential fortheir fermentation. Considerable obscurity still exists withrespect to the nature and composition of this fermentingprinciple, but late experiments render it probable that it isrluten, or rather Zimome. (912) 1066. The Ferment or Yeast is a substance which separatesunder the form of flocculi, more or less viscid, from all thejuices and infusions which experience the vinous is commonly procured from the beer manufactories, andis hence called the Barm of Beer. 1067. If a mixture of five parts of sugar, twenty of water,and one of yeast, be introduced into a matrass, furnished witha doubly bent tube, the end of which is made to pass under aninverted jar in the hydro-pneumatic trough, as here repre-sented, the following phenomena will present If the materials in the matrass be exposed to a temperatureof from 70° to 80°, we shall speedily observe the syrup tobecome muddy, and a multitude of air bubbles to fifrm allaround the ferment. These unite, and attaching themselvesto particles of the yeast, rise along with it to the surface. 56 442 iAHISS MEDICAL CHEM1STRV. forming a stratum of froth. The yeast will then disengageitself from the air, fall to the bottom of the vessel, to reac-quire buoyancy a second time by attached air bubbles, andthus in succession ; at the same time bubbles of carbonicacid will continue to pass over into the jar of the pneumatictrough. After a certain period, however, this intestinal mo-tion will cease, and the fluid, depositing a sediment, will be-come clear; it is no
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