238 Horeign Notices in Mineralogy, &c. 
work, “ on the Formsof the Inorganic Kingdom,” of which 
the first part will appear next Easter, and the second the 
nee summer. Having iuihed this interesting work, 
ext prepare and put to press, an account t of his 
Galecacattenk investigations in ee Alps and in Italy.” 
“ Extraordinary mass of Platina discovered in Peru.— 
A negro slave in the gold mines of Condoto, in the goveri- 
ment of Choco, in South America, found a mass of platina 
of extraordinary magnitude, and which is now deposited in 
the Royal museum, in Madrid. It weighs rather more than 
one pound and a third, and is the largest piece of this metal 
hitherto met with. The largest specimen brought from 
America by Humboldt, and deposited in the King’s cabinet 
in Berlin, and which weighs 1085 grains, was also found in 
Choco. These facts allow us to hope, that platina may be 
found in its - Fe mareewhere! in oh sonny 
Dr. B ‘ie pe ee ie Sear " 
ral brought from hd by Earl icone (Resident ean the 
Geological Society of London.) “It is found in sinali 
transparent or semi-transparent crystals, lining the cavities 
of an amygdaloidal rock from Vesuvius. ‘The crystals are 
right prisms, nearly rectangular, with plane summits ; or the 
same figure truncated on the lateral edges, so as to compose 
an eight sided prism, This last form is the rsost common. 
Comptonite, by exposing it in the state of powder to the 
action of nitric acid, is convertible into ajelly, like all the 
mesoty pes.—It scratches stilbite, fluor spar, and apatite, 
but not mesotype. It is distinguished from stilbite, 
by its being convertible into a jelly by nitric acid, a prop- 
erty not possessed by stilbite. It is distinguished from 
auvergne mesotype, and from the mesotype or prea 
of Iceland by the angles of the primitive prism, &c 
From No.5 of Edinburgh’ Philosophical nseads 
< Sgn of three new species of net ore found at Lead 
hills ; by H. J. Sanne Esq. F. R. S. Lond. M. G. 8. 
ys 
Kies some specimens of lead ore from Lead hills, I 
vave found three new species, of which two have been no- 
