Scientific amusements . copal, mastic, shellac, caoutchouc, and gutta-percha are all resinousbodies. Amber is a mineral resin,which was by the ancients sup-posed to be the tears of birdsdropped upon the refers to this in his poeticFarewell to Arabys Daughterâ Around thee shall glisten the loveliestamberThat ever the sorrowing sea-bird haswept. Amber is not soluble either inwater or alcohol ; it is, however,Crushing mill. soluble in sulphuric acid. It takes a good polish, and when rubbed is very is composed of water, an acid, some oil, and an inflam-mable gas which
Scientific amusements . copal, mastic, shellac, caoutchouc, and gutta-percha are all resinousbodies. Amber is a mineral resin,which was by the ancients sup-posed to be the tears of birdsdropped upon the refers to this in his poeticFarewell to Arabys Daughterâ Around thee shall glisten the loveliestamberThat ever the sorrowing sea-bird haswept. Amber is not soluble either inwater or alcohol ; it is, however,Crushing mill. soluble in sulphuric acid. It takes a good polish, and when rubbed is very is composed of water, an acid, some oil, and an inflam-mable gas which goes off when the amber is distilled. The well-known camphor is got from a tree called theLaurus Camphora; it is a white, waxy substance, andcan be obtained by oxidizing certain volatile oils. It isgenerally produced from the Laurus Camphora in a behaviour of a piece of camphor in pure water iscurious, but its motions can be at once arrested by touchingthe water or dropping oil on the surface. This pheno-. ALBUMEN. 179 menon is due to the surface tension of the liquid, whichdiminishes when it is in contact with the vapour of thesubstance. Nitrogenous Substances. There are certain albuminous compounds which wemust mention here. These are albumen, fibrine, andcaseine. Albumen is the white of egg; fibrine is, whensolid, our flesh and muscular fibre, while caseine is thesubstance of cheese. These are very important com-pounds, and the albuminous bodies are of the very highestimportance as food, for the solid portion of blood, brain,and flesh consist, in a great measure, of them. Albumen,fibrine, and caseine contain carbon, hydrogen, nitrogen, andoxygen, with sulphur and phosphorus. Albumen. The most familiar and the almost pureform of albumen is in the white of eggs, which is albumi-nate of sodium. It also exists in the serum of the blood,and therefore it is largely found in the animal can also be extracted from seed or other vegetable sub-stances, but it is
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Keywords: ., bookcentury1800, bookdecade189, booksubjectscientificrecreations
