416 Scientific Intelligence. 
0-1 to 0°5 grams; one fulgurite weighed only 07122 grams. 4 
glass formed is that which would naturally result from the fusion 
of the adjacent minerals. It is brilliant, with mammillary sur- 
face, conchoidal fracture, varying in color and ianepeaa 
‘ous cavities, caused by the 
vapor of the water which moistened tl 
form in the homogeneous vitreous mass, which are fragments of 
the minerals torn off but not fused. The glass exerts no action on 
polarized light. An analysis of a fulgurite from Mont Blane de 
Seillon on the gneiss gave the following results :— 
(8) MeO Alkalies 
65°73 19°59 or =o vid [4:37] = 100 
The analysis proves that the iron of the chlorite has been oxt 
dized as was to be inferred from the dark color of the glass. 
M. Brun states that thus far fulgurites have been observed a 
nine of the high peaks of the Alps, and adds that many more wil 
doubtless be discovered if attention is directed to the subject. 
7. Paleontology of the Eureka District; by CHaRLES D. 
Watcort, U. 8. i J. Po 
; . 4to, with 24 plates.—Some of the results of Mr. Wal- 
cott’s study of the Eureka fossils (his personal collections) are 
mentioned in a notice of the second Annual Report of the Geo 
logical Survey, in this Journal (xxvii, 65, 1884). In the Mest 
now published the species are described in full, with a ager oo 
of such paleontological conclusions as the present state of t 
facts appeared to warrant. Th 
ulatus and a a 
e report makes out for the region over 60 Cambrian specie 
two-thirds of them Trilobites, and over 100 Silurian spec! 
nearly half of which are new. 
_ The number of species and genera is sufficient to enable - 
