Chrome found combined with Iron. 305 
is now no longer a mere conjecture fupported By loofe analo- 
gies—we fee the ftrongeft probabilities daily’ accumulating in 
favour of the opinion: It muft only,be remembered, that fo 
defirable a change cannot be effeéted by the agent applied in. 
any manner to any conftitution. It mutt be prope erly uted in 
proper cafes. ‘ . 
* Confidering the prefent abundance of expert chemitts, we 
eannot prelisdie: that others will not be able to prepare tlre * 
gas perfectly without our inftructions. Neverthelefs, thofe 
who attempt to ufe it medicinally fhould be apprized that the 
utmoft care is neceflary in its preparation and employment. 
A deleterious, inftead of a falutary fluid, as the author can 
atteft from his own painful experience, may eafily be obtained. 
Probably neither Dr. Prieftley, nor the Dutch chemifts, ever 
procured that which can be refpired with fafety. The differ- 
ence, and its caufes, will hereafter be pore out. 
“* Tf, therefore, in confequence of that premptitude which 
journals afford, experiments tending to invalidate any part of 
» the preceding fiatement fhould be publifhed, we hope that its 
perfect fidelity willnot on that account be doubted, The ex- 
perimenter will be found to have employed a different agent 
from ours. This we have no hefitation in declaring that we 
fhall be able to thew.’’ 
From the preceding fhort extracts, our readers will fee what 
an interefting field is opened for the advancement of phyfio- 
ogy and medicine; and we hope that fome will be induced 
‘to affift an inftitution, which ought not to be confounded 
with ordinary charitable foundations. It is eftablithed for the 
fake of relieving from a fpecies of diftrefs, from which no de- 
gree of affluence can exempt—namely, that which arifes from 
the imperfect fiate of medicine. Subfcriptions are received 
by Mr. Couts, Banker, Strand, London ; and by Mr, Savery, 
Banker, Briftol. 
CHROMAT QF IRON, 
C. Pontier, correfpondent to the Journal des Mines, 
tranfmitted lately to the Cabinet of the Houfe of Inftruction, 
among other interefting minerals, a fubftance in an irregular 
mafs, of a dark brown colour, having a metallic {plendour 
Vor. V. Rr and 
