The naturalist's and traveller's companion, containing instructions for discovering and preserving objects of natural history, etc / [Anon].
- John Coakley Lettsom
- Date:
- 1772
Licence: Public Domain Mark
Credit: The naturalist's and traveller's companion, containing instructions for discovering and preserving objects of natural history, etc / [Anon]. Source: Wellcome Collection.
38/84 page 28
![[ £8 ] I. AERIAL MATTERS'. i. Mephitic, fixable, or fixed air, h heavier than common, or vital air, and frequently mixed with water? by which union, common water is capable of diiTolving iron, and thereby forming a chalybeate fpring, as in Pyrmont, Spa, and many other celebrated mineral waters. Tins mephitic air is detected by lime-water, the former precipitating the calcareous earth of the iattei in a white powder, h o dilcover the quantity of this aerial matter, a bottle filled with the mineral water, fhould be tied over the mouth with a loofe bladder: the bottle is then to be placed in boiling water, the heat whereof will extricate the mephitic air, which rifing into the bladder, may be collected by tying the blad- cier clofe to the neck of the bottle, and after¬ wards meafured by a proportionable bulk of water. (See Se£h V.) II. SALINE BODIES. i. AN acid is fometimes found in the com- pofition ol mineral waters, which is always the vitriolic. a. In](https://iiif.wellcomecollection.org/image/b30515555_0038.jp2/full/800%2C/0/default.jpg)
