Licence: Public Domain Mark
Credit: Remarks on Mr. Robert Dossie's Institutes of experimental chemistry. Source: Wellcome Collection.
9/20 page 7
Licence: Public Domain Mark
Credit: Remarks on Mr. Robert Dossie's Institutes of experimental chemistry. Source: Wellcome Collection.
![[7] —. - -a.— may be dyed with cochineal, by means of putrid urine 5 an addition which would deftroy the fcarlet tint : a That urine con¬ tains an acetous ammoniacal fait ; whereas it contains, in the ftate he mentions it, neither one nor the other of the ingredients of that fait: That the matter in urine, which forms the calculus, is chemically of the fame nature with tartar of vegetables; tho* it is acknowledged not to have any one of the fpecific characters of tartar, to be neither fubacid, nor convertible into an alkali : That the pigment, called PruJJian blue, is, in its whole fubflance, no other than a blue fixt animal fulphur ; b whereas it is demon- Arable that Frujfian blue is iron, and that no fulphur of any kind is contained in ani¬ mals : That the property of galls, and fome other vegetables, of turning folution of vitriol black, depends not on their aftringency, but on a peculiar fpiritc; a notion repugnant to the author^ own principles, for the tinging matter cannot be made to rife in diflillation, * Page 456, Vol. i. b Page 397, Vol. i. 5 Page 39, Vol. ii. which »*](https://iiif.wellcomecollection.org/image/b30785923_0009.jp2/full/800%2C/0/default.jpg)
