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gram. Mainly used externally in plasters Authors are not agreed tjje proper methods grouping resinfe, oleo-resins and balsams, or in their definitions what these substances are.
For instance, what shall call oleo-resins are called balsams Berg substances which shall call balsams are included in resins Berg and Maisch will therefore define what mean these several groups in the introductory description each group, but must consider the general facts now, that may understand the relation these various substances each other. It probable that in the vast majority all plants a substance formed which the nature what generally called a volatile oil while this name not strictly speech writing help correct or scientific, none the terms suggested as substitutes for have ever met with popular acceptance. Volatile oils are odorous volatile liquids, which cause greasy stains upon paper, resembling those produced fixed oils, but differing from the latter disappearing when the stained paper heated. They are freely soluble in or miscible with alcohol, ether, chloroform, benzin, benzol, fixed oils and bisulphide carbon, but only a very limited extent in water.
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Most them exist ready formed in the plants, but some few, as oil mustard and oil bitter almond, are produced peculiar fermentative processes certain plant-elements in Volatile oils are usually obtained from their plant sources distillation, but sometimes, as in the case orange and lemon oils, mechanical methods.
These oils may undergo a peculiar change, termed resin ification, either while still in the plant-cells, living or dead, or after they have been separated, in their containers.
The resin which formed during this change oxidation may remain in solution in the unchanged volatile oil, when the mixture the two constitutes an oleo resin this fluid solution resin in volatile oil may obtained making incisions, etc.
in the plant, and may come letter writing help online into trade need help in essay as oleo resin also called terebinthina or turpentine as in the case copaiba or Canada turpentine or may exude spontaneously and the volatile oil may then evaporate, leaving the resin alone as a solid exudation the outer surface the stem or other part the plant or the resin may deposited help write an essay term papers writers in the cells the plant often in special cells or containers, which are termed resin-ducts, resin-cells, etc. in which case they may obtained for trade heating the wood or other plant-part which contains the resin, or dissolving out with some solvent and then evaporating the solvent or precipitating the solution resin in alcohol or other solvent pouring need help with research paper into water, decanting after settling and recovering the solvent distillation from the water.
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The oleo resin existing in the plant may also contain benzoic, cinnamic or similar aromatic acids, and whether gathered in the liquid form, as an oleo-resin containing order papers online these balsamic acids, or as resins with the volatile oil evaporated, the result a balsam the characteristic which makes a balsam being the presence the balsamic acid or acids, not the presence or absence the volatile oil.
To come now the consideration this group, the resins.
Resins are solid substances, fusible at a comparatively low heat, decomposable at a high heat, combustible, burning with a sooty flame, insoluble in water, soluble in the same solvents as volatile oils, while some are also soluble saponin able in alkaline The latter kind resins act chemically as acids and are termed resin-acids. Most resins consist a mixture resins which can separated and which have different chemical properties in each cases they are distinguished prefixing Greek names letters, thus alpha-resin, beta-resin, etc.
those having the most active behavior as acids being designated Borne the commercial resins retain need help with my dissertation insignificant quantities volatile oil, or contain traces a balsamic acid, as occasionally in dragon's blood, bat not enough either constituent make them either The following resins exude from plants, either spontaneously or in consequence incisions, punctures insects or other injuries Mastic, sandarac, dammar, copal, dragon's blood, and occasionally guaiac resin lac a mixture exuded resin and imbedded insects amber a fossil resin rosin a residue from the destination a volatile oil from an oleo-resin and guaiac resin often prepared meriting the resin from the heart wood fire. Only a few these drugs are any importance as medicinal agents most them are only used in the arts, Roundish, pale yellowish, transparent, brittle tears becoming Elongated, pale yellowish, transparent tears crumbling when thesis research proposal Roundish, yellowish or strawcolored help with homework handwriting transparent masses harder Irregular spherical or angular, yellowish brownish pieces transparent hard Copal. often wrapped in palm leaves. Irregular brittle masses, or large tears greenish brown reddishbrown Guaiacl Small twigs surrounded a brownred resinous substance Thin, brittle, brown or reddishbrown scales Roundish or flat, pale yellowish brownish-red pieces dull exterior, glossy transparent Yellowish or brownish, transparent, brittle masses H. Mastic. A concrete resinous exudation, obtained incisions in the stem the male plant homework help research paper Pistacia Lentiscus Anacardiect. Greek archipelago, Island Ghio, and other Mediterranean countries. Globular or elongated tears, about the size peas, covered with a whitish dust from attrition, pale yellowish, transparent, with vitreous fracture brittle, but becomes plastic when chewed differentiation from sandarac balsamic odor, especially when warmed, and a mild terebin thin ate taste. Trace volatile oil, alpha-resin, soluble in cold alcohol, soft, sticky beta-resin, insoluble in cold alcohol mastic completely soluble in ether, but only partially soluble in alcohol. Mild stimulant, but used almost exclusively for filling teeth, making varnishes, etc.