. 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. 34(1 The World's Commercial Products i, ' N y, â JâJ'^TVr^ bL-f,Mii to exude t;mn in the P t^irt- . , ^Ti~~M tliird year of growth, when tliey are trom eight to ten feet higii. and have a niaxi- mum girth of from six to eiglit inciies. Tiiey rontinue to produce gum until the tifteentii year, wiien it is advisable to renew them. The best yields ,u'e o
. 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. 34(1 The World's Commercial Products i, ' N y, â JâJ'^TVr^ bL-f,Mii to exude t;mn in the P t^irt- . , ^Ti~~M tliird year of growth, when tliey are trom eight to ten feet higii. and have a niaxi- mum girth of from six to eiglit inciies. Tiiey rontinue to produce gum until the tifteentii year, wiien it is advisable to renew them. The best yields ,u'e obtained from the eighth to the twelfth years of growth. "Hashab Wady " is the name ap])lied to gum whicli is exuded naturally from "hashab" trees not in- cluded in the " genena," and is usually in pear- shaped pii'ces of variable si2e depending on the length of time between consecutive pickings. Most (if tlie gum exported is merely cleaned, but a small(juantity is "selected" and 'â specially dried " Fnr this purpose nearly (olour- less â â tears "' are selected from the crude " hasliab" and exposed on the sand along the banks of the Nile to the sun. After a few da\s of this treatment they become white and almost opaqui'. due to the jiroduction of innumerable cracks as the result d the drying. This gum fetches a higher price than the crude mixed material. For most purposes to which gum is applied in cnmmerce, the crude unselected "' liashab "' is suitable, but for a few purposes " graded " or " selected " gum is required. The " selection " of gum is principally done in luu-oj-ean centres of trade, such as Trieste. London, and Hand)urg. Si;ni:(.\i. (ii;.\[. The "liashab" tree (Acacia Scnc'^al). from which Sudanese gum is princii)ally derived, occurs right through the fertile belt of territory (the Central and Western Sudan), which â¢Stretches across Africa bel.
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectbotanyeconomic, booky
