Page:Proceedings of the Royal Society of London Vol 1.djvu/360

Rh 1. That which is semi-transparent blueish, and of the consistence of jelly.

2. What is transparent and ﬂuid, as mucilage.

The 3rd is thick, opake, and straw-coloured, or white, and very tenacious.

4. Puriform matter secreted without breach of surface.

5. Matter consisting of the mixture of the 2nd and 3rd, or 2nd and 4th varieties.

6. Pus from vomicaa, arising from tubercles.

7. Pus from vomicze, consequent on simple inﬂammation.

The author next treats more at large of the sensible or obvious properties, including smell, taste, weight relative to water, and ap- pearance under the microscope.

The next division of the subject includes the agency of heat; the separation of a coagﬂum, or curd, at temperatures from 150° to 170°; the properties of the curd, and of the residuum which it leaves when burned; the saline contents of the ﬂuid separated from the curd, and obtained b evaporation.

Under t e same head of agency of heat is also included the pro- cess of distillation to dryness, the properties of the ﬂuid distilled, and of the residuum.

The action of alcohol is next tried, both on the residuum left by distillation, and also on different kinds of expectorated matter in their fresh state.

Next follow experiments on the miscibility of these matters with water, and also a set of experiments made with acetous acid. After other miscellaneous experiments, the author concludes, that the va- rious kinds of expectorated matter consist of the same ingredients, but that the proportion of these ingredients is somewhat diﬁ'erent; that expectorated matter consists of water containing certain saline and earthy bodies, together with a coagulable albuminous oxide, amounting in general to between one sixteenth and one twentieth of the whole, but sometimes not exceeding one ﬁftieth part, and at others amounting to as much as one tenth.

The saline ingredients are stated to be,

Muriate of soda, varying from 1 to 2 in 1000 parts.

Potash, neutralized by animal oxide, 0'4 to 0'7.

Phosphate of lime, 04 to 0'5.

Ammonia, united probably to phosphoric acid.

Phosphate, perhaps of magnesia.

Carbonate of lime.

Indications of sulphate of lime.

Vitriﬁed matter, perhaps With silica.

Oxide of iron in too small proportion to be estimated.

The last six substances scarcely amounting to one thousandth part.

The different consistence is ascribed to the different quantities of albuminous oxide. The thicker matter is also said to be less saline than that which is more ﬂuid.

The author observes, that all the animal ﬂuids contain potash, but