The treasury of botany: a popular dictionary of the vegetable kingdom; with which is incorporated a glossary of botanical terms . k, theproduce of C. micrantha and C. nitida;Loxa, or crown bark, the produce of ; red bark, &c. The greatvalue of these barks as tonics and re-medies for fevers, depends upon the pre-sence of certain alkaloid substances calledquina, cinchonia, and quinidina, whichexist in the bark, especially in the liber orinner bark, in combination with kinic andtannic acids. It is found that certain ofthe barks contain more of one principlethan of another; hence their
The treasury of botany: a popular dictionary of the vegetable kingdom; with which is incorporated a glossary of botanical terms . k, theproduce of C. micrantha and C. nitida;Loxa, or crown bark, the produce of ; red bark, &c. The greatvalue of these barks as tonics and re-medies for fevers, depends upon the pre-sence of certain alkaloid substances calledquina, cinchonia, and quinidina, whichexist in the bark, especially in the liber orinner bark, in combination with kinic andtannic acids. It is found that certain ofthe barks contain more of one principlethan of another; hence their greater orless value commercially, and the skill andcomplex knowledge required by the manu-facturer to distinguish the different va-rieties of bark one from the other. Quinais the most useful of the alkaloids, andthis is found in greatest abundance inCalisaya bark; cinchonia occurs mostabundantly in the best grey and redbarks; while Loxa bark furnishes thelargest amount of quinidin. The severalalkaloids have all similar properties, butvarying in degree. Quina, in its combina-tion with sulphuric acid, is the most gener-. 2S5 K\yt €nra£itrw at 3Satang. [CINC ally used under the name of sulphate ofquinine—next to opium and calomel, pro-bably the most important of all alkaloids extracted from the harksare recognised by their distinctive chemi-cal characteristics, while the barks pro-ducing them are likewise distinguished bya careful scrutiny of their external ap-pearance, the lichens, &c, growing onthem, the way in which they break, theirtaste, odour, &c, as well as by their mi-croscopical and chemical these varied points require long prac-tical experience for their due way in which the barks break, or thefracture, as it is termed, depends on theiranatomical structure, that is to say, onthe size and arrangement of their cellularand woody portions. Where the formerpreponderates, the fracture is smooth andeven, and such barks are sa
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Keywords: ., bookcentury1800, bookdecade1860, bookpublisher, booksubjectbotany
