ig4< Mr. Chenevix’s Analysis of 
ment of science, than to discover one more of those simple 
substances, by the union of which she forms the complicated 
effects we daily admire. Yet to me it appears, that, in no 
instance is she more truly wonderful, than in the unbounded 
variety which she has sometimes produced from a small fund 
of original resources ; and, when we can fairly follow a few 
primitive substances, through a series of combinations infinitely 
multiplied. 
In addition to the two chymists who, as is mentioned in 
the preceding Paper by the Count de Bournon, appear to 
have had some knowledge of the existence of a natural arse- 
niate of copper, I must name M. Vauquelin. In a letter to 
me last year, he communicated the discovery of such a substance 
in France. Of the different varieties which these gentlemen, 
Messrs. Klaproth, Proust, and Vauquelin, have examined, 
I shall have occasion to speak, in the course of these experi- 
ments : but it was reserved for the Count de Bournon, to 
state, in the said Paper, with his usual talent and perspicuity, 
the scientific detail of the external characters, particularly of 
the crystalline forms, by which he had identified their nature. 
The free access to the extensive collections of the Right 
Hon. Charles Greville, and of Sir John St. Aubyn, also 
the easy communication with the native soil of this mineral, 
were the peculiar advantages, which enabled the Count de 
Bournon and myself to pursue the mineralogical and chymical 
researches, which are stated in these communications to the 
Society. 
When the Count de Bournon had completed what ap- 
peared to him to be the mineralogical classification of these 
copper ores, he gave me some specimens of each kind. 
