232 «=S. L. Smith—Magnetic Properties of Nickeliferous Iron. 
Nore py J. LAWRENCE SMITH. 
After completing my researches on the Ovifak iron and do- 
lerite of Greenland,* which had occupied me off and on for sev- 
eral years, establishing indisputably the terrestrial origin of that 
iron, I was induced to examine into the nature of some other 
native irons, whose origin was somewhat equivocal. One that 
has been supposed to be of meteoric origin is that discovered, 
in 1875, at St. Catarina in Brazil. Having obtained specimens 
of this iron, I tried to apply to it the same rules of investiga- 
tion as I had done to the Greenland iron, but my series of spe- 
cimens would not permit of this and the question was left in 
doubt. My first object was to separate a pyritic mineral asso- 
ciated with the iron; but owing to the fact that the metallic iron 
permeated the pyrites in numberless filaments, it was impossi- 
ble to conduct this separation by means of the magnet, nor 
have I as yet been able to devise any other method. While ap- 
plying the magnet to various parts of the pure metal, it was 
possible origin. : 
* Comptes Rendus, vol. xci, and Annales de Chimie et de Physique, 5* ser-, xvi, 
1879. 
