88 THE CANADIAN NATURALIST. [Vol. vi. 



V. 



Protoxyd of iron 24.66 



Peroxyd of iron 22.24 



Titanic acid 26.95 



Oxyd of manganese 1.10 



Lime 1.12 



Magnesia .72 



Insoluble 23.80 



100.59 



Metallic iron 34.94 



Mingan. — The iron sand from the south of the St. John river, 

 at Mingan, contained 48.3 per cent, of magnetic grains, whose 

 analysis is given under VI, while that of the non-magnetic portion 

 of the ore is found under VII. 



VI. VII. 



Protoxyd of iron 80.46 46.31 



Titanic acid 6.50 31.60 



Oxyd of manganese .52 1.35 



Lime 75 1.06 



Magnesia 70 .50 



Insoluble 4.20 15.50 



93 13 96.32 



Magnetic oxyd of iron. . 86.92 



Metallic iron 65.58 36.00 



The sum of the analysis VI, if the iron be estimated as mag- 

 netic oxyd, is 99.59. 



In the above analyses of the iron sands it will be remarked 

 that the magnetic portion retains a little adherent silicious matter, 

 and small amounts of titanium, both of which vary in the sands 

 from different localities, although the separation by means of the 

 magnet was in all cases effected with the same precautions. Ob- 

 servations and experiments on other samples of these sands go to 

 show that different layers from the same locality vary, not only 

 in the proportion of silicious sands, but in the relative proportions 

 of magnetic and titanic ores and of garnet. This might be ex- 

 pected when we consider that the differences in density between 

 each of these constituents of the sand, should, under the influence 

 of moving water, lead to their partial separation from each other. 



A specimen of iron sand from Quogue, on the south side of 

 Long Island, near New York, where these sands are about to be 

 employed for the manufacture of steel, closely resembled those of 



