Journal of Natural Philosophy, Chemistry and the Arts . by temperatures below 190° or 200^ Fahrenheit; at higher tem-peratures it becomes turbid, and deposits a pale brown sedi-ment : if in this state it be poured upon a filter, the waterpasses through without colour, so that exposure to heat notonly destroys the red tint, but renders the colouring matterinsoluble in water,alcohol and Alcohol and sulphuric ether added to this solution also ren- der it turbid, and when these mixtures were filtrated, a colour- less and transparent liquor was « precipl- 4, The matter remaining
Journal of Natural Philosophy, Chemistry and the Arts . by temperatures below 190° or 200^ Fahrenheit; at higher tem-peratures it becomes turbid, and deposits a pale brown sedi-ment : if in this state it be poured upon a filter, the waterpasses through without colour, so that exposure to heat notonly destroys the red tint, but renders the colouring matterinsoluble in water,alcohol and Alcohol and sulphuric ether added to this solution also ren- der it turbid, and when these mixtures were filtrated, a colour- less and transparent liquor was « precipl- 4, The matter remaining upon the filter was insoluble intate partly so- water, in alcohol, and in sulphuric ether 3 but when digestediuble in acids. ,., . . , 1 • -j ,- ..1 m dilute muriatic or sulphuric acid, a portion was taken up forming a brown solution. I regard this soluble portion as amodification of the colouring matter produced by the opera-tion of heat: the insoluble, residuum had the properties of albumen. * Halter, Elem. Pliysiulog. Vol. 1, p. 51. Ejects. CHEMICAL RESEARCHES ON THE ANIMAL FLUIDS. JQl 5. Effects nf Acids on the colouring Matter. A. Muriatic acid, poured upon the colouring matter of (he The colourin?jblood, renders one portion of it nearly insoluble, and of a matter treatedbright brown colour : another portion is taken up by the acid, ^ji^ : ^forming a dark crimson solution when viewed by reflectedlight J but when examined by transmitted light, it has a green-ish hue. This solution remains transparent, and its colour is unim-paired by long exposure to light, either in contact with theair, or when kept in close vessels. At its boiling temperaturethe colour is also permaneni. Infusion of galls produces no change in this muriatic solu-tion, nor is its colour affected by carbonated alkalis, even whenadded in considerable excess. It is rendered brown red by supersaturation Mith causticpotash, but not with soda, or ammonia : these, and especiallythe latter, rather heighten its
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