120 Mr. Hatchett’s Analysis of the earthy Substance 
The substance here examined was composed therefore of the 
following ingredients. 
Pure siliceous earth or silica - < 
fF. 
grains. 
0.90 
1 L. 
267.25 
Alumine J 
r E. 
1.20 
1 
. H. 
76 
Oxide of iron - 
G. 
26.50 
Dark grey particles 
K. 
7-5o 
Water and vegetable matter 
A. 
19.20 
39 8 *55 
The foregoing analysis was repeated several times, and al- 
ways with similar results ; excepting, that as I had taken the 
specimens from different parts of a large quantity, I found that 
the proportions of the ingredients were not constantly the same: 
that of the siliceous earth, for example, was sometimes greater, 
and the alumine and iron proportionably less. Some specimens 
were also nearly or totally destitute of the dark grey shining 
particles ; in short, every circumstance was such as might be 
expected from a mixed substance, which, from the nature of its 
formation, cannot have the ingredients in any fixed proportion.* 
As this substance agreed in its general characters, for the 
greater part, with that described by Mr. Wedgwood, and as 
it was indisputably brought from the same place, there appeared 
every reason to believe that the nature of both was the same ; 
* The description given by Mr. Klaproth convinces me, that his experiments 
were made on a portion of this substance. Moreover, when my late friend Mr. Hai~ 
dinger was in London, I gave him some of this earth for his collection; so that, 
whether Mr. Klaproth made his experiments on that which had been received by 
Mr. Hai dinger fro m Sir Joseph Banks, or from myself, it is not less certain that 
he operated on that which might be regarded as the genuine Sydneia. 
