DYES AND TANNING MATERIALS. 161 



CANAIGRE is the root of the Texan Dock (Rumex 

 hymenosepalus, Torrey), recommended by Mr. Christy. 



MIMOSA EXTRACT was sent from Australia as 

 early as 1823, but dropped out of notice till recently. 

 In 1 880 we imported 682,296 worth of various Bark- 

 extracts. 



TERRA JAPONICA or GAMBIR, extract of Uncaria 

 gambir, Roxb., and U. acida^ "Hunt., of Singapore, of 

 which 3,234 cwt. were imported in 1830, we received 

 to the extent of over 23,000 tons in 1875. 



HEMLOCK EXTRACT, from Tsuga Canadensis, Carr., 

 was first patented in 1864. 190,000 dollars' worth 

 was made in 1881, 305,000 dollars' worth in 1883. 



CHESTNUT EXTRACT, from C&staneasativa^^.Jnas 

 been recently imported from the Continent ; and one 

 of the latest introductions, a result of the Edinburgh 

 Forestry Exhibition of 1884, is the bark of the Sal of 

 India (Shorea robusta, Gaertn.), which yields 32 per 

 cent, of tannin.* 



KlNOS are too costly for tanning : EAST INDIAN is 

 obtained from the wood of Pterocarpus marsupium, 

 Roxb. ; AFRICAN from that of P. erinaceus, Poiret ; 

 BENGAL, PULAS, or DHAK, from Bute a frondosa, 

 Roxb. ; WEST INDIAN from Coccoloba uvifera, Jacq., 

 and AUSTRALIAN from Eucalyptus resinifera, Sm., etc. 



Among dye-stuffs that have long been in use are 

 the following : 



LOGWOOD (Hcematoxylon campccJiianum, L.), a Legu- 

 minous tree, native of Central America, introduced 

 into Jamaica in 1815, of which the heart-wood is 

 employed as a red or black dye. Its price varies 



* ' Leather,' July, 1886. 



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