J. L. Smith—New Meteoric Mineral, Daubréelite. 109 
Without giving any further details of the nature of this 
region of Mexico where these meteorites were collected, suffi- 
cient has been stated to show the probable source of the cal- 
careous incrustation which I discovered upon two of them. 
This incrustation on meteorites has been discovered but twice 
before, and in both instances by myself. One of them, however, 
18 of so obscure and unsatisfactory a character that I have not 
given any public notice of it. e other is the case of the 
Newton County meteorite described by me (this Journal, II, 
vol, xl, 1865). It is a meteoric stone belonging to the variety 
classified by M. Daubrée as Syssidéres; specimens of it have 
been furnished by me to the museums of the Garden of Plants, 
reat Britain and Vienna, with this incrustation in well defined 
particles of a translucent character adhering firmly to the sur- 
face. The entire amount of this meteorite yet known does not 
exceed 700 grams, although the primitive mass must still exist 
in a sparsely settled region of Arkansas, and when obtaine 
Will no doubt furnish specimens with a larger amount of the 
calcareous incrustation upon it. 
2. New Meteoric Mineral, Daubréelite. 
Two of the masses of iron above referred to have been cut 
across, the section made on one of them being over fifteen 
decimeters; also several transverse cuts have been 
have been exposed, most of them quite small, and hardly any 
®xceeding a centimeter in diameter. At the first glance all 
these nodules have the appearance of very finely crystallized 
troilite; but a little closer inspection reveals the fact that most 
of these nodules have more or less of a black mineral associated 
With it. I had never seen anything of the kind before, it being 
Structure, occurring on the borders of the troilite nodules, and 
Sometimes running across the center of them, as may be seen in 
