152 aon Intelligence. 
dark gray, more granular in texture and sreeeais ange from the 
other. Held oe the light in very oblique angles, it shows a paler 
gray ~ and a little lustre caused by the damask. frog wis 
the d ark mass are very minute brighter — parti 
gray without — in one corner there is some aphite, ning a 
roundish parcel of sulphid of iron. The plates from Arva iron, howev 
present great differences eae themselves, FA. Gm 
9. Meteoric Iron from Tucson, Arizona.—A mass of meteoric iron from 
Tueson has been presented to the city of San Francisco by General Carle- 
ton. In a recent letter, Prof. Whitney ies that this iron is 4 feet 11 
and weighs 632 lbs. It was found at or near Tucson, Arizona, by 
Gen. Carleton’s California column on coe march ‘throngh that region, 
and has evidently been used for an anvil, although it is not the one fig- 
ured by Bartlett as aves served that purpose. 
A een en of this me teorite was sent to Prof. Brush, of Yale College, 
cavities which, on the fresh fracture, were lined with a white silicious mine 
ral, giving the surface 5 porphyritic, or ee appearance. ie a 
specific gravity is 7°2 en a fragment of it laced in a solution — 
of neutral sulphate 8 copper, it oars quickly jesioe with cnetalile cope 
per, proving the iron to be ‘active.’ Attacked with an acid, a potion of 
the iron was dissolved, leaving the silicious mineral projecting from 
face of the — and, with a magnifier, black particles of ncbeibeal 3 
ite could b n. er complete solution of the i iron, a careful micro- 
scopic mine was made of the insoluble residue. With a magnify: 
ing power of 25 diameters, it appeared to consist chiefly of two substal- 
ees: one a milk-white to pont Sa mineral, having a fused, rounded sur 
face, occurring in little globules, or elongated, rounded particles ; while 
the other constituent was black and angular, and attractable by the er? 
net. The first named substance, when observed with a magnifying p 
of 100 diameters, proved to contain minute specks of the black 
minated through it; some of the silicious fragments were trp: cen 
and of a milk-white color, and others colorless and transparen arg 
number, however, were transparent at one end, shading into milk 
at the other, , thus aT a to nee that the eeeapanent 
