Method of Making Permanent Artificial Magnets. 335 
Crystalline, Compact. 
Cobalt, - 18.5 . - 19.5 
Iron, - - 1.3 - - 14 
Arsenic, - - 79.2 - - 19. 
If we assume the trifling unessential commixture of iron to be 
a substitution for cobalt, then this composition corresponds to the 
ormula Co As*, a combination, which must contain according to 
estimate 20.74 parts of cobalt and 79.16 of arsenic. 
The name proposed by Scueerer for this mineral, arsenic-co- 
balt-pyrites, appears to me in other respects little appropriate. 
It is a striking circumstance that neither of these minerals con- 
fains nickle, which is elsewhere so constant a concomitant of 
cobalt ; at least, it must have occurred in so minute a quantity 
as not to be observed in the small portions of the minerals sub- 
jected to analysis. 
Arr. VI—A New Method of Making Permanent Artificial Mag- 
nets by Galvanism ; by J. Lawrence Sarrn, Student of the 
Medical College of the State of South Carolina. 
_ Ever since galvanism has been known to produce magnet- 
sm especially under certain forms of apparatus, it has been a 
Steat desideratum to retain permanently, the great power that 
is generated within the limits of a few square inches of metal. 
few years since, having seen what an intense degree of mag- 
hetie force could be generated in a bar of soft iron, by passing 
galvanic currents around it ; the idea (very natural to most persons 
Witnessing the same experiment) occurred to me, whether this 
Magnetism conld not in some manner be retained; I was aware 
that so long as soft iron was made the agent it could not; and if 
tempered steel was used a difficulty would also present itself, 
and it was not until about eight or ten months since that the 
following experiments were put into operation. The object that 
ad in view, was to substitute for the iron used in the electro- 
Magnet, red hot steel and cool it suddenly. 
A few feet of copper wire were coiled as shown in the figure, 
the arrangement being such, that the galvanism in its circuit 
Would generate north and south polarities, at the end of the re- 
