SCIENTIFIC SUMMARY. 
103 
languages on the subject of metallurgy and mineralogy, which will make it 
most valuable to those interested in the subject. We have so high an 
opinion of this periodical, that we prepare our summary almost altogether 
from its pages. 
Iron and Iron Ores. — A pamphlet has been issued by Dr. Sterry Hunt, 
F.R.S., entitled u Notes on Iron and Iron Ores,” being a report addressed to 
Sir W. Logan, F.R.S., late director of the survey (published by Dawson 
Brothers, Montreal, 18.70). The contents of this, pamphlet are arranged 
under the following heads : — 1. A comparison of the iron ores of Canada 
with those of Sweden and Norway. 2. Chemical analyses of the Canadian 
iron ores. 3. Notes on the iron sands of Canada. 4. A sketch of the dif- 
ferent methods of making iron and steel direct from the ore. 5. A descrip- 
tion of the Ellershausen process for making malleable iron. Some of the 
facts brought forward by the author specially connected with the Canadian 
iron manufacture are considered of sufficient interest to warrant their being- 
reproduced in Mr. Forbes’s report. 
Blast Furnace Sublimates. — A chemical examination of the sublimate or 
incrustation (Cadmia) which attaches itself to the inside of the upper por- 
tion of the lining of the blast furnaces at Stenay (Meuse) has been made by 
MM. Nivoit and Letrange, whose report, published in the u Annales des 
Mines,” 6, Ser. XXVIII., p. 113, gives its composition as follows: — 
Oxide of zinc • 89*10 
Oxide of lead 5-91 
Sesquioxide of iron with alumina . , 1-90 
Lime 097 
Sulphuric acid 0-13 
Silica 0*56 
98-57 
Phosphorus in Iron and Steel. — According to Salet, the presence of phos- 
phorus in iron and steel may be detected by examining with the spectroscope 
the flame obtained by burning the hydrogen produced on dissolving the 
metal in hydrochloric acid. 
The Magnet in Practical Mineralogy. — For the purpose of separating the 
magnetic oxide of iron from the magnetic titaniferous iron ore, quartz, &c., 
which gives so much trouble and expense in working the Canadian iron 
sands, a simple, ingenious arrangement has been patented by Dr. Larue, of 
Quebec ; in this the ore in the state of sand or powder, is delivered from a 
hopper, arranged so as to open and close at proper intervals, and to allow 
the ore to spread in a thin and uniform layer, upon a series of aprons, 
arranged with interspaces, between two parallel endless bands, which pass 
over two horizontal cylinders. These aprons, charged with ore, are made, 
by the movement imparted to one of the cylinders, to pass from beneath the 
hopper, under a series of permanent horse-shoe magnets, 800 in number, 
each capable of sustaining about five pounds ; arranged upon transverse bars, 
in five rows of 160 magnets each. Beneath these is a tympan, covered with 
muslin, which, when the iron ore is passing beneath them, is in contact -with 
the poles of the magnets ; as soon, however, as the magnetic portions of the 
ore have arranged themselves by attraction, in adhesion to the under side of 
