found to penetrate pretty deep into the body of the glass, and Loe 
ea ere identify the diamond with carbon ; but, as‘ always like 
424 Scientific Intelligence. 
Rough cast iron may, by these means, be made to assume a very beau- 
tiful ‘appearance ; and articles thus coated will be preserved from oxyda- 
tion in the. interior of habitations. With regard to those intended for 
the open at they must be covered with a suitable varnish, in order to 
ese m. This process is recommended by M. Becquerel. 
. New Property of Coke; by Jamzs Nasmytu, (Mining Journal, 
lubp. 29, 1848.)—Having just read in your Journal of the 22d, some 
observations on the important. experiments of M. Jacquelain, in refer- 
ence to the conversion of diamond into coke, it occurs to me, that 
it may be interesting to some of your readers to be made aware 0 of a 
discovery in close connection with this subject, which | made — 
years ago, and which. Professor Faraday has done me the honor to 
communicate to the Royal Institution. The g rand distinction sepa 
ge of M. Jacquelain and mine is ae this, that while he 
discovers that diamond | can be men into coke, I had long since dis- 
glass; but it will be found that coke.does not scratch, but rea 
truly ewts the glass, which any of our readers may prove, by , 
small fragment of coke, and switching i it at random, across and a 
a pane of glass while the sun is shining through it, which will 
the beautifully clear, diamond-like cuts more distinct ; they will be 
forth most beautiful prismatic colors, as the light of the sun fall: 
m. So far this m may be all very pretty and interesting, as tendi 
y ma 
some application ; for, although I do not expect to see bt 
ar Ps a inde ‘to cut the glass for the repair of broken 
