2 yg Mr. Gilpin's Tables 
then the proportion is, as this quotient (or what the specific 
gravity would be without concentration) is to the real specific 
gravity as found in the same horizontal line of the second co- 
lumn of the table, so is the sum of the quantities of spirit an 
water in the third and fourth columns inversely to the bulk of 
the mixture- 
Col. VI. is obtained by subtracting the reat bu.k of the mix- 
ture in col. V. from the sum of the quantities of spirit and 
water in col. III. and IV. the difference between them being 
the diminution occasioned by the concentration on that whole 
quantity. Col. VII. is obviously to be computed by the fol- 
lowing proportion : as the bulk of the whole quantity of the 
mixture in col. V. is to too (the constant quantity), so is too 
to the quantity of pure spirit per cent, at the temperature of the 
table. Col. VIII. is formed by reducing the volume of the spin 
per cent, at the temperature of the table, to itsvolume at 60 , by 
the following proportion : as ,825 (the specific gravity of pure 
spirit at 60°) is to its specific gravity at the given temperature, 
so is the number in the seventh column to the volume of pure 
spirit at 60° of heat, contained in too parts by measure of the 
mixture at the temperature of the table : this divided by too is 
the decimal multiplier sought ; the product of which into any 
measure of a spirituous liquor of the corresponding specific gra- 
vity and temperature, will be the true quantity of standard 
pure spirit, at 60" of heat, contained in that liquor. 
It may very probably be thought right, for the future use 
of the revenue, to compute another set of tables, in which the 
degree of heat standing at the head of each table, the first 
column of it shall be even numbers of specific gravity. 1 his 
would be proper for looking out at once the quantities of spirit 
