22 
TIIIC GEOLOGY GE AUCKLAND. 
Coke, trable, retains tlie granular structure of the coal ; dis¬ 
integrates when exposed to air ; during combustion gives out 
little heat; and leaves a large mass of stone-coloured ash ; 
specific gravity, 1*471. 
( Combustible matter ... 39*25 
Composition-' Silica and alumina ... 54*44 
v Protoxide of iron . 6*31 
100*00 
This coal is well adapted for the purpose of gas manufacture ; 
the quantity produced is not large, but you will observe of a 
high quality, approaching several of the Scotch cannels in 
illuminating power. 
The coke is of very inferior quality for heating purposes ; but 
the quantity of iron share found in it is so great that it may 
possibly turn out to be a product of value. 
James Patterson, 
Civil Engineer. 
I subjoin comparative average analyses of three principal 
kinds of fuel, from which it may be seen that the Drury coal 
is precisely similar to the European brown coals in the propor¬ 
tion of its three principal constituents : 
Brown 
Black Coal 
Wood. 
Coal. 
and Anthracite. 
Carbon .. 
. 51-4to52 - 6 
55 to 76 
73 to 96-ol 
Oxygen .. 
. 43 
42 
26 
19 
23 3 
Hydrogen 
6 
5-5 
4-3 
/-v 
2-o 
5-5 0 -5 
I embrace the opportunity of saying a few words on the 
commercial value and applicability of the Blew Zealand Brown 
Coal . 
Although of entirely different character, and, generally 
speaking, of inferior value, to the older coals of the Primary for 
mation, I cannot see any reason why this kind of coal should 
not be used in New Zealand for the same purpose as a similar 
brown coal is extensively applied to in various parts of Europe, 
and particularly in Germany, where it supplies the fuel for 
manufactures of all kinds, for locomotives and steamers, and for 
domestic purposes. I am perfectly familiar with this kind of 
