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The yew-tree in the little churchyard at Chorlton had still some coagulum of thaw-frost on it when the brougham plashed past the closed lichgate, and left its ingrained melancholy to make the most of its loneliness. Strides Cottage was just on ahead five minutes at the most, even on such a road.
The former supplied a diluent, the latter a haven for the indisputably used-up quill whose feather served to incorporate it with the black coagulum.
When the clarified juice of nutritious vegetables, such as cauliflower, asparagus, mangelwurzel, or turnips, is made to boil, a coagulum is formed, which it is absolutely impossible to distinguish from the substance which separates as a coagulum, when the serum of blood, or the white of an egg, diluted with water, are heated to the boiling point. This is vegetable albumen.
The humidity of the soil seems to account for the undulating form of the edges of the dapicho, and its division into layers. I often observed in Peru, that on pouring slowly the milky juice of the hevea, or the sap of the carica, into a large quantity of water, the coagulum forms undulating outlines.
But where am I leading you? you will ask, with all these uninteresting details about glue. Wait a little and you shall hear. This coagulum owes its color to an infinity of minute red bodies of which we will speak more fully by and by, and which are retained as if in a net, in the meshes of a peculiar substance to which I am now going to call your attention.
At the postmortem the cicatrix in the chest was plainly visible, and in the ascending aorta there was seen a wound, directly in the track of the knife, which was of irregular border and was occupied by a firm coagulum of blood. The vessel had been completely penetrated, as, by laying it open, an internal cicatrix was found corresponding to the other.
In this process the coagulum only plays a passive rôle by forming a scaffolding on which the granulation tissue is built up. The ligature surrounding the vessel, and the elements of the clot, are ultimately absorbed.
When left to stand in an open vessel, a thick coagulum forms on the top, which the natives term cheese, and which they eat in a similar manner, and with, equal relish.
We have already mentioned that the caoutchouc is the oily part, the butter of all vegetable milk. It is, no doubt, a particular modification of caoutchouc that forms this coagulum, this white and glossy skin, that seems as if covered with copal varnish.
When the coagulum extends to the whole mass, the yellow spots again disappear. Acids precipitate the caoutchouc from the milky juice of the euphorbiums, fig-trees, and hevea; they precipitate the caseum from the milk of animals. A white coagulum was formed in phials closely stopped, containing the milk of the hevea, and preserved among our collections, during our journey to the Orinoco.
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