. India rubber world. a briefdigest of this interesting contribution. He refers to the factthat the first Span-ish invaders ofSouth Americaearly became ac-quainted with theuses to which thenatives were puttingthe gum from therubber tree, and healso refers to thewell known factthat the first gen-era! mention madeof rubber in Eng-land referred to itspossible use forerasing pencilmarks, a matterbrought to publicattention by Priest-ley. At that time sta-tioners retailed itfor 7s. 6d. ($)per cubic inch. Itsfirst use in connec-tion with clothingdates from 1820,when Thomas Hancock took out his fi
. India rubber world. a briefdigest of this interesting contribution. He refers to the factthat the first Span-ish invaders ofSouth Americaearly became ac-quainted with theuses to which thenatives were puttingthe gum from therubber tree, and healso refers to thewell known factthat the first gen-era! mention madeof rubber in Eng-land referred to itspossible use forerasing pencilmarks, a matterbrought to publicattention by Priest-ley. At that time sta-tioners retailed itfor 7s. 6d. ($)per cubic inch. Itsfirst use in connec-tion with clothingdates from 1820,when Thomas Hancock took out his first patent for that pur-pose, to be followed by Macintosh and Goodyear. Since thenimprovements have rapidly been made in the utilization of rub-ber, which now ranks among the most important and valuableof the worlds vegetable products. Concurrently with tliis demand, the sources of supply werethoroughly investigated, and over 100 plants were discoveredwhich produced more or less valuable grades of rubber, in-cluding :. Courtesy of Hacienda. B:fu:!u. of SoiTu America.—Hevca, Caslilha, Ceara {ManihoD andMangalieira (Uaiicoriiia)..\fric.^.—Laiidolfhia and funtumia. Asia.—Picus ciastica, HUloughbeui. Urccola and vines ofless value. PROSPECT OF DEARER many years the natives penetrated the forests and col-lected the rubber wherever it was to be found, in most casesdestroying the trees or vines. This method, by increasing of collection, rendered the business unprofitable, so thatthere was a prospect of the price of rubber advancing to apoint which would preclude its use for ordinary , Sir Joseph Hooker, Director of the Kew BotanicGardens, induced the British government in 1873 to send anexpedition under Mr. James Collins to Amazonia after the few hundred seeds thus obtained, a dozen plants wereraised, which were sent to Calcutta, but all died, being imableto withstand the climate. In 1876 Mr.
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