. The world's commercial products [microform] : a descriptive account of the economic plants of the world and of their commercial uses. Plant products; Produits naturels; Produits végétaux; Natural products; Botanique agricole; Botany, Economic. 348 The World's Commercial Products Mixtures of cssfiitial oil :iii(l resin. Tlicsciirc usually \is- iims li(|uiils or scnii-solids. IC.\ami)lfS : " lialsaiu of Copailia," \\MO(l oil, clciui, Canada balsam. 3. Iliilsnms (iiul hiihamic resins. Tlicsi' inavhi' eitluT licjuids suili as 'â balsam of I'crn " or solids sucli as 'â
. The world's commercial products [microform] : a descriptive account of the economic plants of the world and of their commercial uses. Plant products; Produits naturels; Produits végétaux; Natural products; Botanique agricole; Botany, Economic. 348 The World's Commercial Products Mixtures of cssfiitial oil :iii(l resin. Tlicsciirc usually \is- iims li(|uiils or scnii-solids. IC.\ami)lfS : " lialsaiu of Copailia," \\MO(l oil, clciui, Canada balsam. 3. Iliilsnms (iiul hiihamic resins. Tlicsi' inavhi' eitluT licjuids suili as 'â balsam of I'crn " or solids sucli as 'â ; Tliey contain either benzoic or cinnamic acid, and the pres- ence of one or both of these acids or then- compounds confers on them their peculiar â â balsamic " odour. These true â â balsams " should be distinguished from such pro- ducts as co])aiba and Canada â â balsams," which are really oleo-resins. 4. Cum-rcsins. These are 'S of tru( gums with resins and may also contain some essential oil. Examples : Myrrh anc asafoetida. The cojials are a class o hard resins used in the pre paration of elastic varnishe: suitable for outdoor use, as for example, on railwa) carriages. Thev are derived fron many different trees and are jiroctu'ed from >everal countries. They are always very hard melt with aitViculty. are usually msoluhle in all solvents and are only convertible mttrnctive distillation. [n all the localities in'which cojial is jiroduced. three qualities are generally put on tli mukrl : 1. Fossil Copal, foimd in flu- ground usuallv in districts from which copal tnr have entirely 'ired. 2. Scnii-lossiliscd Copal. colliM-ted from the soil in the neighboni hood . ;i Crcsh Copal, found on li\ing trees either as the result > exudation through natural fissure- or from incisions. Of these three kinds the lu> is of mo>t value. â¢â¢ fresh copal "" inmg of little \alue in luuopcan l-.
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectbotanyeconomic, booky
