Of mordants or bafes, 167. Of their antiquity, 170. Hifiory of the origin and progrefs of callico print ing,j 171 — 176. Remarks on the aluminous mor dant, or acetite of alumine, 176 — 184. Experi ments, &c. Tending to illufirate the differences of colouring matters, as well as the afiion of the alu minous bafis when employed in dying, 184 — 189. Of the application of the aluminous hafis to linen and cotton, 190. To {ilk and wool, 192. Of the ufe of iron in fixing colouring matters previ cully applied to wool and frlk, ibia'. Mr. Haufil mann fhewn to be mi?aken in confidering alumine and the oxide of iron as the only mordants or bafes, 193. Remarks on Mr. Berthollet's Opinion, that certain colours refult from combufiion, 197.