Artificial Crystallization of Copper. 253 
he did not fail with his natural acumen to perceive this advan- 
tage and in his earliest patent he remarks: “ After ample exper- 
haceous matter, dispensing with a draft and its cooling and 
wastful influence and rendering the combustion so perfect that 
bl 
aware appeared in the scientific Journals. I am not without 
Personal experience of its operation on a large scale, having in 
1857 enjoyed the opportunity of studying carefully the manage- 
Ment of one of Thompson’s furnaces in three compartments 
(Similar to Figs, 1 and 2) built for the combustion of wet peat. 
That fuel contained over seventy-five per cent of its whole 
Weight of water and was too wet for the best results, But with 
he use of one-fourth part of dry wood, even this extremely wet 
and otherwise valueless fuel was rendered efficient, three cords 
(of 128 cubic feet) of wet peat and one cord of dry wood doing 
the work of four cords of dr y wood in driving a steam boiler. 
——— 
: , Arn, XXVI.— Note ona case of Artificial Crystallization of Metallic 
Copper and Dinoxyd of Copper; by J. W. MALLET. 
| ahedral edge. Along with these erystals of copper there 
Were little cubes of the ainnxyel of copper in great abundance— 
