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13'. DoftoT Butler ufed capital foap-lees, in the 
proportion of a wine quart to if gallons of fea-water, 
which fufficed for four or five times repeated pour- 
ings-in of more fea- water into the ffill. But as I 
have found, that a fmall quantity of chalk has the 
fame good effedl, and is cheaper, and more eafily to 
be had, it is therefore preferable to foap-lees. 
14. When there is a fire in the cook-room, the 
fea-waier might be ready heated to put into the ftillj 
without any additional expence of fuel, in the fol- 
lowing manner, which I fliall here defcribe j tho’ 
I think it probable that it will not be put in prac- 
tice ; yet, as farther improvements may poffibly 
hereafter be made in it, and as it may be of ufe in 
fome cafes, at land at leaf!:, I fhall here give an ac- 
count of* it, njizi 
1 f . About the year 1 7 1 8, Mr. Schmetou, a Ger- 
man gentleman, got a patent here for heating great 
quantities of water, with little expence of fuel,- which 
he then fhewed me. Having fixed a fpiral iron worm-* 
pipe, in fuch a- brick ffove or chimney as women 
heat their irons in, thereby caufing the water to run 
from a veffel,. through the worm-pipe, feveral feet 
length round, in the fire. About thirty years after 
I acquainted Mr Cramond of Twickenham with this3 
as hoping it might be of benefit in didilling fea- 
water. Upon which he procured fuch a fpiral iron 
worm- pipe, which was about twenty feet long, and 
fix-tenths inch diameter j , the diameter of -the fpiral 
coile was about fourteen inches. 
16. This I fixed >in a brick ftove in my garden^ 
with its upper end fixed to a veffel, which contained 
45 gallons of water. I found the event of this firfl 
