300 ON THE JUICE OP THE SUGAR-CANE. 
mill, about 250 grammes, taking care to select it in a state of compres- 
sion which represents on the average the result of the ordinary action of 
the cylinders. This bagasse is then weighed, and after having placed it 
in a little bag of strong cloth so as to preclude all after loss, it is sub- 
mitted to a rapid washing in luke-warm water, then to a complete dry- 
ing in the stove, and the weight is again ascertained ; the difference be- 1 
tween these weights gives the quantity of juice remaining in the bagasse 
and which had necessarily escaped the crushing power of the mill. 
Let B = the weight of the damp bagasse. 
B' = the weight of the dry bagasse. 
C = the weight of the woody substance contained in 
100 parts of the canes passed through the mill. We shall then have 
c - — I£= X, or the quantity of the juice extracted correspond- 
ing to B of bagasse furnished by the mill. The quantity of canes cor- 
responding to the same weight of B of bagasse being represented by 
■ ■ | ; ■ ■ ,we see that the yield of any kind of mill can be easily calcu- 
lated by the plan of two successive weighings of a small quantity of 
the bagasse produced ; for, strictly speaking, we can dispense with de- 
termining the value of C by a special proof, this quantity not present- 
ing great variations, and being generally of the average of ten for the 
finest kinds of Bellognet and Diard and 11*5 for the other kinds. 
In order to facilitate this operation, I shall give the following ex- 
ample : — 
A mill of forty horse power acting on Guingham cane stalks which 
contain 11*5 per cent, of woody fibre, gives a bagasse of which a por- 
tion perfectly similar in appearance by its state of compression to the 
total of the bagasse produced, weighed when damp, 207*63 grammes, 
and when dry, 87 "30 grammes. To find according to the above formula 
the quantity of juice extracted from 207 '63 grammes of moist bagasse, 
87*30 must be multiplied by 100, and the product divided by 11*7, 
from the quotient 759*1 grammes, 207*63 are to be subtracted, which 
leaves 551*5 grammes. As the above quotient of 759*1 grammes is 
simply the equivalent of the quantity of canes producing the bagasse 
submitted to experiment, it is clear that the yield of the mill will be 
definitely given by the proportion: 759*1 : 551.5 :: 1 : X = 72.6 
per cent. 
It is at the same time clear that the absolute quantity of juice being 
100 — 11 *5, there has been left in the bagasse 15*90 ; (a) it therefore results 
that, in round figures, for every 100 parts of juice contained in those 
(a) Juice extracted 
Juice remaining in the Bagasse 
Woody fibre - 
Grammes. 
- 551.5 
. 120.33 
- 87.3 
Grammes. 
72-6 
15.9 
11.5 
759.13 ... 100.00 
