BOOK III. CFIAP. Vr. 573' 



fb fetid, that the feiifcs will fuHiciently caution againfl: the admitting 

 any of it into the Itomach. 



The moll: common impregnations in the Jamaica waters are, 

 On the South fide — a foliile muriatic fait, terrene particles, and 

 particularly lime-ftone. 

 ! On the North fide — Terrene, argillaceous, fl:ala£tite matter, and' 

 chalk. 



There are iikewifc, of the mineral clafs, fuch as are known to be-, 

 impregnated with iron and fulphur; and others, that arc fufpeded to 

 contain copper,, lead, or allum. 



I. Brackish, or Water impregnated with a Muriatic Salt,^ 

 Is difcovered, by letting fall two or three drops of folution of filver 

 (in ^^//(^/^/'//ij into a glafs of it ; when, if there is ever fo fmall a^ 

 quantity of that fait, it will unite with tlie aqua for lis, and caufe it 

 to feparate.from the filver, which will fall (lowly in the form of a. 

 white cloud; and if the proportion of the fait be large, the cloud 

 will have a curdled appearance, and a coerulean cad. 

 2. Tkrrene Impregnation. 

 A few drops of oil of tartar will dilcover a fuperabundance of earthy 

 matter, by caufing it to precipitate to the bottom of the glafs,, in a. 

 whitilh cloud or lediment. 



3.. Calcarious and Stalactic Matter. 

 Syrup of violets dete<5ls alcaline as well as acid particles; com*-- 

 municating to the water agreenilh tinge, if an.alcali, and red, if an 

 acid predominate?. 



4. Vitriolic, Chalybeate, or Iron. 

 The milder acids, as vinegar and lemon-juice, poured into a 

 chalybeate water, give it a fweetifh tafte. But the principal tefl: ofr' 

 the iron impregnation, is the black colour it flrjkes with a vegetable 

 artringent, as tin£lure of galls; and the purple caft when an alcaline 

 fait, or lime water is added to the adringent ; and which is of 

 deeper hue in proportion to the larger mixture of the alcali. The 

 galls of which the tincture is made, for purfuing this experiment, 

 fliould be blue, of the llrongeft kind, frefli and lound. 



5, Sulphur 

 is diftinguhhed by the tafte, and inflammability of the fediment; 

 and by the waters ftriking a. black colour, with a few drops of: 



folutioiii 



