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90 per cent abst acetic acid adulterant Aeidum Alcock P.J. alkaloids ammonia amount amyl alcohol arsenic ash limit assay Barclay P.J. December Bascombe CD Bird P.J. bismuth British Pharmacopoeia c.c. of solids c.c. of water cadinene camphor chloride chloroform citral colour commercial samples contain copaiba diluted dissolved Dowzard CD drug estimation ether eucalyptol evaporated examined Extractum F. C. J. Bird filtered formula gives glycerin grammes of solids grammes per 100 heat J. C. Umney P.J. liquid extract Liquor Lyon P.J. melting melting-point method mixed mixture Moor and Priest nitric acid obtained official process official requirements ointment Oleum optical rotation P.J. December 17 permanganate potassium Power Y.B.P. precipitate preparation Priest CD Priest Y.B.P. quantity residue resin salt saponification says scammony shaken sodium sodium arsenate solids per 100 soluble solvent specific gravity stearoptene strophanthin suggests sulphuric acid syrup temperature tincture tion titration turpentine Upsher Smith P.J. volume washed yield