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POPULAR SCIENCE REVIEW. 
the various contortions of the surrounding rocks. It is found in Halleflindt 
— a rock which is considered by the Swedish geologists to be a compact 
variety of gneiss. The ore is always accompanied by a rock consisting of 
garnet, hornblende, augite, and epidote. The author compared the large 
deposits of Perseberg to "a deposit at the Crown’s Pock, Botallack Mine, 
near St. Just, Cornwall, where magnetite is accompanied by the same 
minerals, and occurs under the same conditions as at Perseberg, only on a 
much smaller scale. 
Analysis for Black Spindle. — At one of the recent meetings of the French 
Academy, M. Pisani gave the results of his analysis of a black spinelle from 
the Haute Loire. The specimen was remarkable from its crystalline form, 
which was that of an octohedral pyramid, and it is found also in the igneous 
rocks of Auvergne. The following is its composition : — 
Alumina 59*06 
Ferric oxide 10-72 
Ferrous oxide * 13-60 
Magnesia ........ 17-20 
Copper'- Nickel Alloy. — The following method for the production of this 
alloy has been described by M. Stromeyer in a late number of the Chemical 
News, and is that in general use at Dittenburg Nassau : — 1. Bate melting : 
roasting the ore, and smelting it to coarse metal. 2. Concentration melting : 
roasting the coarse metal, and smelting it to concentration of a regulus. 3. 
Refining melting : separation of the iron from the concentrated regulus. 4. 
Roasting and reducing process : transformation of the regulus into oxides of 
copper and nickel by roasting, and the reduction of the latter to copper- 
nickel. The further details of the processes will be found in the Chemical 
Neivs, August 2. 
Composition of Specular Iron. — The following result of the analysis of 
the iron used for cast-steel cannons has been given in a German chemical 
journal. The specimen was dissolved by electrolysis in hydrochloric acid : — 
Carbon # . . . 3-758 
Iron ......... 87*997 
Manganese 6-555 
Phosphorus . . 0-578 
Silicon . . . 0-497 
Sulphur 0-171 
Calcium 0-127 
Copper 0-120 
Arsenic 0*118 
Magnesium 0-052 
Antimony 0*027 
Silver, lead, bismuth trace. 
Vide Annalen der Chemie f bd. 140, p. 180. 
Russian Mineralogy. — The French Academy has been presented by M. 
Kokscharow with the fifth volume of his Materialien zur Mineralogie Russ- 
lands. 
