The Photographic News for Amateur Photographers ..., volume 1
The Photographic News for Amateur Photographers ..., volume 1
Sir William Crookes, Thomas Cradock Hepworth
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{To be continued,) ORGANIC CHEMISTRY — (continued). Experience teaches us that oxygen may unite, either with carbon to form carbonic acid, or with hydrogen to form water. Now, as we have already stated, organic bodies being for the most part formed of carbon, hydrogen, oxyeen, and nitrogen, it is by no means strange that certain of these bodies are modified, and, in some cases, wholly destroyed, by exposure to atmospheric air. Fermentation — a term employed hr chemists to indicate the spontaneo...us decomposition which animal or vegetable substances undergo under certain circumstances — ^is eSao one of the causes of modification or destruction of organic matters. Different organic substances that are eminently decomposable, and are employed to provoke fermentation in other bodies, are known as ferments; as, for instance, in the case of beeis a little yeast causes fermentation in the whok poass ; or if the juice of grapes be exposed to a gentle heat, it begins to effi^vesce— it loses its transparency; a viscid scum rises to the surface ; the taste is chimged — it has now a vinous taste, and may, if properly managed, be converted into wine, pqring the process of fermentation the snga^ Digitized by Google Dec.
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