Cane Mills; and Megass as Fuel. 53 
as compared with the cane ; there is also saving in 
handling megass against canes. 
At Tuschen with a small single plant the indicated 
power is 63 horses and the crushing is 62*56 ; the week's 
make, 70 hhds. Reducing this to the horse power per 
hogshead per week under the varying extractions we have 
crushing 
Tuschen '85 H.P. per hhd. with 62'56 
Providence 1*40 do. do. do 66'oo 
„ 2'44 do. do. do 7770 
Thus if I want to increase my extraction at Tuschen to 
be equal to Providence first operation 3*5 per cent addi- 
tional, it will be necessary to increase the power 55 0/0, 
and to come up to the final results at Providence, calls 
for almost exactly 3 times the present power. 
Mr. Shields is under the impression that it is simply 
a question of applying power, when at one operation 
the same expression might be gained as at two. That 
is to say that if the combined power, 244 horses, were 
applied to a mill of sufficient strength, the same 77 
per cent, could be extracted. I join issue with him on 
this point, as from all the experiments that I have made 
with what is called dry double crushing, I have never 
been able to get beyond 68 to 69 per cent. In other 
words when 68 to 69 per cent, has been extracted and 
the megass is again passed through the same mill, more 
firmly braced up, the result is nil. 
I am entirely at one with Mr. SHIELDS with re- 
gard to the new hydraulic mills introduced by Mr. 
Duncan Stewart the well known engineer of Glas- 
gow, for keeping the rollers up to their work ; for a 
safety valve was undoubtedly required to afford relief 
under unnatural strains. Every one who has had to 
