ON THE REDUCTION OF IRON BY HYDROGEN. 11 
ART. IT.— REMARKS ON THE REDUCTION OF IRON BY 
HYDROGEN. 
BY WILLIAM PROCTER, JR. 
«, 6) a self-regulating reservoir for generating hydrogen, 
i c, arrangement for washing and drying the gas. 
(? ; furnace with reduction tube enclosed. 
/ g ) sectional view of the reduction tube. 
As there has been an increased demand for "prepared 
iron" or iron reduced by hydrogen, which has chiefly been 
supplied from abroad at a high price ? it has been thought 
that the publication of a few practical remarks on the appa- 
ratus and process, based on a repetition of the operation 
many times during the past year, will be attended with ad- 
vantage, notwithstanding that a valuable paper on the same 
subject by M. M. Soubeiran and Dublanc was transferred 
from the Journal de Pharmacie to the 17th volume of this 
work. 
It need hardly be stated that the " prepared iron" of 
pharmacy is metallic iron in that minute state of division 
which it presents when its oxide at a red heat has been de- 
oxidized by a current of hydrogen gas. The elements of the 
process of manufacture, therefore, consist of means for gene- 
rating and purifying hydrogen gas, and for containing and 
