[ r2 + ] 
to the bottom, and a metalline fcum or cremor, which 
fwim on their furface ; we {hall next consider the 
appearances, which they make in this water. 
Exp. 8. A foiution of faccharum Saturni being 
dropt into common fpring-water, left the upper parts 
of the water clear and colourlefs, but formed a lac- 
telcency towards the bottom. The fame foiution 
being added to the mineral water, foon turned it of 
a turbid yellow colour, which afterwards fublided, 
and formed a deep yellow cloud in the bottom of 
the glafs ; and below this yellow fediment there ad- 
hered to the bottom of the glafs a whitifh fubftance, 
which I took to be the metalline parts of the faccha- 
rum Saturni feparated from the purer parts of the 
fait, which were Hill fufpended in the water, and 
which made it of a muddy whitilh colour. 
9. Forty drops of oleum tartari per deliquium be- 
ing added to an ounce of the water, made it of an uni- 
form light yellow colour ; but in an hour afterwards 
there were many fmall yellow terrene nubeculce 
formed in it. Thefe the next day were more con- 
fpicuous, being thoroughly feparated from the water, 
and precipitated to the bottom, leaving the water 
quite clear, as it was before the mixture. A fmall 
quantity of this limpid water being taken, it would 
afford no tindture with galls. It was then all poured 
off, except fo much in the bottom of the glafs as 
contained the above-mentioned clouds : to this there 
were fome galls added, which in half an hour turned 
thefe clouds from a light yellow to a deep red colour, 
but did not change the colour of the water, in which 
they fwam. 
io. Im- 
