A philosophical inquiry into the nature and properties of water / [John Rotheram].

  • John Rotheram
Date:
[1770]
Catalogue details

Licence: Public Domain Mark

Credit: A philosophical inquiry into the nature and properties of water / [John Rotheram]. Source: Wellcome Collection.

    42/148 (page 30)
    3° a full and beautiful green, the abforbent earths and calcareous nitre likewife give them a green- ifh caff, but not fo ftrong, nor fo quickly ; and the colour will vary in its brightnefs or intenfi- ty according to the nature and proportion of thefe ingredients. The mineral acids fuddenly turn the fyrup of violets to a bright red ; and if the fyrup be frefh and good it turns red with alum ; but Dr Rutty obferves that, when old fyrup is ufed, it will turn green. Obferve what tincture the Water extracts From galls, jefuits.bark, or any other vegetable atlringent. If it Bribe red or purple, it is a fore mark of iron ; if blue, it fhews vitriol. 8. By dropping in a little folution of quick- filver in aqua-fortis or fpirit of nitre ; or afolu- tlon of fublimate in Water ; if any of thefe meet with an alcaline fait, the]/ drop an orange cch loured, yellow, or white precipitate, as the alcal'i approaches to the lixivia! or urinous kind. i I Q. Mr Boyle was very curious in obfervmg the different tinges made from the lignum no phriticum ; but as I could not conveniently procure that article here, I ufed Dr Rutty s fuc- cedaneum for it, the afh bark ; which I have found to anfwer very well, and by the different ' blue