~and*on Stills. : 9 
*. Before concluding my observations on distillation’ by alem- 
bics, I shall briefly notice the various improvements I have 
successively made on these articles, a great number of which 
T have made both for myself'and my friends. 
Since the year 1775,'1 have used cylindrical instead “of 
serpentine tubes, sometimes straight, flattened, inclined, or 
vertical, but always so disposed as to accelerate the distillas 
tion greatly by their largeness; and being perfectly well po- 
lished, I could easily clearthem, attervevery new operation, 
from every foreign taste or’smell. 
Before auy thing had been anncunced: relative to: ovbid 
might be made of the heat containedsin ‘the vapours whieh 
form by their condensation ‘the distilled liquids, I presented 
to the National Institute an alembic, where this heat ‘was 
rendered profitable in producing the rectification of the pro- 
duce of an anterior distillation,.and in te ct the putse+ 
quent distillation. bois 
The following are the principal salnadienil of the dacibic 
of which I am about to publish»a description ; and inthe 
construction of it I have observed every possible precaution, 
in order to ceconomize ‘the heat and to facilitate the. ae 
tions. 
‘Every part of it must be of pewter. 
© We may distil in it, without inconvenience; 25 given 
measures of liquid, or only a single 25th part of any mea 
sure, and afterwards reduce it to a fourth part by evapora- 
tion. ' 
Each distillation, without augmenting the expense of fuel, 
and without delay, may be accompanied witha rectification; 
and immediately after this double operation, the cucurbit 
being emptied by a syphon, a.cock adapted to it evacuates 
ther liquor intended for;a subsequent: distillation in a’state 
very near the boiling temperature ;. the subsequent distillas 
tion is consequently effected much more quickly, and ‘with 
“much lese fuel, 
By means of four watch-glasses and three smal! tubes, 
every thing is seen which passes inside the body of the still 
and its cylinder, the rectifying vessel, and the preparatory 
one, 
After 
