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death of millions of mankind ; then navigation wlli 
become remarkably more healthy, and with little 
more danger to health and life than at land, except 
from florms. 
2 2. Now fuppofing, that, in a fixty gun fliip, the 
1 1 o tuns of water, for four months ufe, were di- 
ftilled at the expence of three bufhels of coals ta a 
tun, this would confume nine chaldrons of coals : 
And as a chaldron of coals weighs about a tun and 
half ; hence it appears, that coals will diftil about 
eight times their quantity of water. And the no 
tuns of water weighing (at the rate of 2240 pounds 
to the tun) 138 tuns j and the nine chaldrons of 
coals weighing thirteen tuns and half, that is 94 tuns 
and half lefs than the iio tuns of (lore water; and 
allowing twenty-four tuns and half for the ftill, wa- 
ter-cafks, and coals, there will be 70 tuns weight of 
ftowage faved thereby, for other ufes. Or if fome 
tuns of ilore-water are carried by way of precaution, 
which it will be advifeable to do, efpecially at firft, 
till they can be alTured, by repeated experience, what 
quantity c;)n be depended upon by dilfillation ; even 
then about half the tunnage will be faved, which 
will be a very material advantage. 
23. Though when the difiilling liquor runs from 
the bottom of the worm-pipe, through a long pipe 
lixed to it, the wafte by the ventilating rufliing air is 
not great^ when the water in the worm- tub is not 
hot; yet the following precaution, if needful, may 
be ufed, in difiilling by ventilation,, to fix at 
tne lower end of the worm- pipe, by means of a 
wooden faucet, a fmall calk for a receiver ; the fau- 
cet to enter the upper lide of the head of the calk, 
and 
