Afi Account of a Metcar. i5£ 



fsTiglitly greenish tinge ; and whose existence is still far- 

 ther proved, by the black colour which was produced, 

 when a solution of this salt was mixed with the liidro 

 gulphuret of ammonia. 



9. — The fluid from which the nickel had been preci- 

 pitated, was now of a yellow colour, unmixed with green. 

 Its present colour was derived from the hidro sulphuret 

 of ammonia, and nothing could now be detected in the 

 solution, except what had proceeded from the various 

 re-agents employed. 



There was, however, one other constituent of the 

 stone, of whose existence the eye furnished decisive evi- 

 -dence, of which no account has hitherto been given, 

 namely, the sulphur. As to the quantity of this, I can 

 give only an estimation. Of the grounds of that esti- 

 mation, as well as of the fruitless attempts which were 

 made to collect the sulphur, I will speak presently; but 

 for the sake of concluding this head, I vvill now add, that 

 the sulphur was estimated at 1,. If this analysis be cor- 

 rect then, the 100 grains which were examined afforded, 

 Silex, ... - 51,5 



Oxid of iron, - -38^ 



Magnesia, - - - - iS, 



Oxid of nickel, - - IjS 



Sulphur, ^ - - - 1, 



105, 

 The excess, instead of the usualloss, proceeds, mani- 

 festly, from the oxidizement of the iron, in a consider- 

 able, but unknown proportion. I must add, that the 

 proportions of these irigredients vary in different parts 

 of the stone, as is manifest to the eye, and will be imme- 

 diately more fully evinced. In the analyses of others, 

 should there be found some difference of proportion, it 

 will not therefore necessarily indicate a contradiction. 

 The great point of the similarity of these stones to tliose 

 which have fallen in other countries, and which have 

 been analysed by Howard, Vauquelin, Klaproth, and 

 Foarcroy, Avho have been my guides in this investiga- 

 tion, will now, in all probability, be considered as sulii- 

 ' ciently' established. Had the daily avocations of a course 

 of public lectures allowed the necessary time, I should 



