56 TlMEHRl. 
more than once dropped into, and misplaced his decimal 
points ; thus, on page 357, the units of heat to be 
deducted under the " Air for Wood" is stated at 4495 
this should be 44957, so that on page 359 the units of 
heat available in 100 ibs. of megass in its green state 
will be as follows : 
100 lbs. wet megass 117,889 available units. 
Resultant weight of above sun-dried 184,889 „ ,, 
Do logie 146,788 ,, ,, 
This not only changes his finding in so far as carbon is 
concerned, but, as I have already pointed out, the relative 
positions of carbon and water contained in any given 
substance is very material as to whether they can be 
made to burn or not, and this is the all important point 
to be arrived at in the now pressing question of burning 
green megass at a profit. What is the expression at 
which it will pay to burn this ? 
On the Leonora estate I am fortunate enough to have 
a variety of furnaces, so that I can practically experiment 
upon megass at all stages. 
Furnace No. 2 is a simple oven furnace in front of a 
tubular boiler 12 feet long, 7 feet diameter, with 96 4-in. 
internal tubes giving a heating surface of 1152a' and was 
first brought to my notice by the late Mr. Tait of 
Mirrilees and Tait when on a visit to the colony early 
in the sixties. Mr. Tait was forcibly struck with the 
large duty done by our copper walls and tubular boilers 
attached in taking up the waste heat ; and among other 
suggestions he recommended feeding by hopper, so as to 
exclude the rush of cold air which took place when the 
fireman stooped down to lift a fresh armful of megass ; 
this was done with excellent results. And following up 
