Elements of pharmacy, materia medica, and therapeutics / by William Whitla.
- William Whitla
- Date:
- 1884
Licence: Public Domain Mark
Credit: Elements of pharmacy, materia medica, and therapeutics / by William Whitla. Source: Wellcome Collection.
Provider: This material has been provided by the Gerstein Science Information Centre at the University of Toronto, through the Medical Heritage Library. The original may be consulted at the Gerstein Science Information Centre, University of Toronto.
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![the left hand, and held there by the right index finger, which presses it downwards as the bottle is sloped to allow the liquid to drop out. Before permitting the drops to fall into any quantity of other medicine a few should be allowed to drop on the floor till the dispenser is satisfied he has perfect control over the regularity with which the drops issue from the bottle in his hand, otherwise they might come out with a rush, ren- dering it impossible to count them, in which case the liquid or medicine into which they fall must necessarily be rejected. This may be avoided by the unpractised dispenser allowing the drops to fall into an empty measure, when, if too many flow out, he can reject them without risking the liquid into which they are to go; but if the drops be volatile, this should not be done. Liquids like chloroform, hydrocyanic acid, ether, nitrite of amy], &c., should not be dropped, but always nwamired* * A ten or twenty per cent, solution of such substances civn be kept in stocli, so that there may be no diflRcuIty in accurately measuring the smalles t quantities, as when two or three drops of dilute hydrocyanic acid are ordered in a draught.](https://iiif.wellcomecollection.org/image/b20996548_0028.jp2/full/800%2C/0/default.jpg)
