Distillation of Ardent Spirit. 257 
When the liquor was reduced to sixty degrees 
of heat, the gravity of each, by my hydrometer, was 
as follows. 
The first infusion had fifty-four degrees of den- 
sity, the second forty-five, and the third twenty- 
five. 
The six gallons of each infusion were divided 
into two equal parts, the one for close the other for 
open fermentation. These were pitched with four 
ounces of yest respectively: the first two parcels at 
66° of heat, the second at 60°, and the third at 55°. 
The reason of operating on liquors of different 
densities, and pitching them at different degrees of 
heat, will be explained hereafter. They are now to 
be considered as six different wo betiate do in sup- 
port of one fact. 
The vessels used for the open fermentation were 
jars equally wide, or rather wider, at the top than the 
bottom. Of those for close fermentation I have 
given two drawings in plate IV. fig. 1 & 2. I pre- 
fer having the ends of the tubes immersed in water, 
as I think it answers the purpose better than com- 
mon valves, If the vessel be closed round the tube 
it is equally air-tight, and the resistance of the wa- 
ter will not be too great for the elasticity of the car- 
bonic acid gas and other fluids which are raised 
during the intestine motion; nor is there any fear of 
the elasticity of the air in the vessel being overcome 
VOL. Vv. is . 
