' [ 321 ] 
not knowing whether this method of heating water 
may not in fome cafes, at land at lead, be of ufe, 
thereby to fave, in fome degree, both fuel and time : 
Perhaps an iron worm- pipe of a larger bore might 
do better. 
1 8. The wade of fuel will be lefs in proportion 
to the quantity diftilled in large, than in fmall dills ; 
and the wider the dilUhead is, fo much the more 
liquor will be diddled, and more with a worm-tub 
than without it. The worm-tub may be fo covered 
as to prevent the flowing over of the water by the 
motion of the diip. 
19. It is of great importance to take care to keep 
all parts of the dill clean, that there may be no rud 
or verdigreafe in the copper, which will occafion vo- 
miting. 
20. If it be neceflfary, the better to clofe the join- 
ing of the dill head, it may be done with a lute or 
pade, made of a mixture of powdered chalk and 
meal, wetted with falt-water. 
21. Now that feveral effedlual means are difco- 
vered, to make didilled fea- water wholefome, and 
alfo to didil it in much greater quantity in the fame 
dill, in the fame time, and with nearly the fame 
quantity of fuel ; it is reafonable to believe, that it 
will be of great benefit to navigation, not only in 
faving much dowage room, for other important pur- 
pofes ; but alfo in procuring fredi fweet wholefome 
water, indead of dinking putrid water, hitherto ufed j 
which murt: needs have a tendency to promote that 
putrid didemper, the fcurvy. And if withal due 
care be taken to exchange for frefh air the putrid 
clofe confined air of ihips, which has occafioned the 
VoL. 49. T t death 
