57 6 Mr. Hatchett’s Analysis of 
1. It has a very strong hepatic flavour and smell. 
2 . A plate of polished silver, put into it, became black in a 
few hours. 
3. It became faintly bluish with prussiate of potash, after 
standing five or six hours. 
4. Tincture of galls produced a faint purple cloud. 
5. Solution of acetite of lead afforded a brown precipitate. 
6 . Nitrate of silver produced the same. 
7. Potash, and ammoniac, caused a precipitate ; but that of 
the former was the most copious. 
8. Oxalic acid produced a precipitate. 
g. Muriate of barytes had also a slight effect. 
The water No. 5. cannot, therefore, be considered as a cha- 
lybeate, (the quantity of iron contained in it being scarcely per- 
ceptible ;) but it appears to be a water containing some hepatic 
gas, together with substances similar to those contained in No. 1 . 
From the above experiments it is evident, that the water 
No. 1. does not contain any of the component parts of the crust 
formed on the copper wire and cuttings, although it is certain 
that the incrustation took place during the immersion of those 
bodies ; but, before I mention my ideas on this subject, I shall 
give an account of some experiments made on the flints, No. 6 . 
These were coated with a yellowish shining substance, which 
appeared to me to be pyrites ; and, as the flints could not have 
contributed any metallic substance to form this coating, I was 
. enabled by their means to ascertain, whether the copper of the 
crust, formed on the wire and cuttings, had been furnished by 
the pieces of copper, or by any thing in the vicinity of the 
water. 
1. I poured nitro-muriatic acid on some of the flints, in a 
matrass, so as completely to cover them. 
