. Chemistry: general, medical, and pharmaceutical, including the chemistry of the U. S. Pharmacopia. A manual on the general principles of the science, and their applications in medicine and pharmacy. t produces no effect add no more ; for it isnot advisable to overload a solution with useless reagents : substancesexpected to come down as precipitates are not infrequently held inthe liquid by excess of acid, alkali, or strong aqueous solution ofsome group-reagent thoughtlessly added. Indeed, experiencedmanipulators make preliminary trials with group-reagents on a fewdrops only of the liquid un
. Chemistry: general, medical, and pharmaceutical, including the chemistry of the U. S. Pharmacopia. A manual on the general principles of the science, and their applications in medicine and pharmacy. t produces no effect add no more ; for it isnot advisable to overload a solution with useless reagents : substancesexpected to come down as precipitates are not infrequently held inthe liquid by excess of acid, alkali, or strong aqueous solution ofsome group-reagent thoughtlessly added. Indeed, experiencedmanipulators make preliminary trials with group-reagents on a fewdrops only of the liquid under examination :, if a precipitate is pro-duced, it is added to the bulk of the original liquid, and the additionof the group-reagent continued ; if a precipitate is not produced, thefew drops are thrown away, and the unnecessary addition of a group-reagent thus avoided altogether—an advantage fully making up forthe extra trouble of making a preliminary trial. While shunning See note on p. 221. ANALYTICAL CHAKTS. 223 Bffl~£ i:i a £ . as a- \ «*^oegg l>8 ml? tr- ST. £ h~! CD ert- •^V .:-5* c era) Jg ~crt; a> j» pj g;a> f^p Oj J&& 2^ a © t MQWaQ- r. ( o^ J^O.
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