418 Scientific Intelligence. 
ses and coatings with botryoidal surfaces which are drusy or covered 
with imperfectly formed crystals. Most of the forms observed indi- 
te the formation of the masses by gradual accretion and not as 
the result of percolation of fused material. But some of the speci- 
mens appear to have been so far fused as to flow down through crevi- 
e0us Oxy inches in diameter, and four to eight inches in length, 
the inside being studded with small crystals. ‘These masses were 
taken from a flue under the retort in which the mixture of ore and coal 
is heated ; a considerable quantity of fused ore had flowed down into 
this flue through cracks and fissures, and the oxyd was found investing 
portions of the surface of this ferruginous slag, which gave it the ap- 
pearance o ving been fused, alihough it was undoubtedly formed 
rom the zinc vapor issuing from the slag. ‘The tubular masses of 
oxyd which seemed to have flowed down, may have lined cylindrical 
cavities in the slag, the specimens having been removed before | saw 
them; I am unable to affirm positively upon this point, but that such 
was the case is indicated by other specimens. : 
It will be observed that in all the cases of occurrence above cited, 
zinc vapor was slowly cooling under circumstances which prevented 
the presence of oxygen in large quantity, indicating that the erystals 
were formed by the slow oxydation of zine vapor and not from dis- 
solved or fused oxy4d. 
e blowpipe reactions with the the purest and cleanest crystals are 
all those of pure oxyd of zinc. The crystals I have under examina- 
tion, and I reserve for another occasion an account of their forms and 
angles, 
Works of New Jersey Zine Co., Newark, March; 1852. 
3. On Carrollite, a new Cobalt Mineral; by Wm. L. Fazer, Metal- 
lurgist and Mining Engineer, (communicated for this Journal by Prof. 
u.)*—Having received through Prof. Booth a cobalt ore 
the results of which are given below. It occurs in a vein of copper 
crystalline and liomogeneous, no distinct crystals were 
observ nd the apparent rhombic cleavage was too indistinct [0 
allow of a definite determination. The hardness spec! 
gravity =458. Lustre allic, tarnished in some pieces, probably 
from the presence of magnetic pyrites. Color tin-white, inclining 10 
steel-gray. Streak iron-black. Fracture uneven; sub-conchoidal 19 
small fragments. Britile. 
Before the blowpipe on charcoal it emits a strong odor of sulphurous 
acid (and arsenic), intumesces, and melts to a white, brittle and mag- 
netic globule. With borax, soda and microsmic salt it shows the usud 
reactions of cobalt and copper. 
si a re a een 
tg communication was received at too late an hour to be inserted as a” 
Acie, 
