Sentence:  That the papers already communicated on this subject might be rendered more complete, we have now added thereto a brief account of such other dyeing substances as are in general use. ... Dyes of animal origin, catechus, <WSD>gamboges</WSD>, and other similar products are excluded. ... <WSD>gamboge</WSD> and dragon's blood can scarce merit the title of dye-stuffs. 
Meaning of the word marked with <WSD> tags:  The resin of the gamboge tree; a preparation of the resin used as a pigment or for medicinal purposes. (from early 18th c.)