Chemistry and Physics. 263 
experiment that it will act on lead when united with brass, and placed. 
under the necessary conditions. 
The only method which I think will counteract this galvanic actiony 
t 
see that it was far from homogeneous in its texture. All the kinds of 
glass examined contain more or less perfectly distinct crystals, regular 
and transparent, encased in an amorphous base e crystals were 
M. Leydolt observes also that some natural crystals pure and trans- 
parent and apparently homogeneous, present similar deficiency In ho- 
mogeneity, with the glass; and he has the subject under further exam- 
ination. 
8. Analyses of Snow and Rain water; by M. Evcrne MagrcHAND. 
—The snow and rain analyzed fell at Fécamp (France) in the months 
of March and April, 1850. A kilogramme of water contained 
Snow. Rain. 
Sulphuric acid, free or combined, - doubtful sensible proportions. 
Chlorid of potassium, - : - doubtful trace 
Chiorid of sodium, - . - 0017037 gr. 001143 gr. 
Chlorid of magnesi: ; - - trace trace 
Alkaline jodids and bromids. - ie, ace race 
Bicar of ammonia, ‘ - 0001290 000174 
Nitrate of ammonia - - - 0:001447 000189 
Anhydrous sulphate of soda, . - 0015627 001007 
Sulphate of magnesia, — - - - trace trace 
Sulphate of lime, —- 5 . - 9000877 0:00087 
Animalized organic matter containing some 
‘on and calcium, ‘ - é 846 0'02486 
Pure water,  - : : ; 999:939876 999°94914 
1000:000000 1000°00000 
The organic matter of the snow deprived of fuliginous matters af- 
forded ond of calcium 0-008116 grammes, peroxyd of iron 0-000450, 
Organic matter 0-015280 — 0°023846. 
9. Titanium and Zirconia in Mineral Waters, (L’Institut, No. 964.) 
—Dr. Mazape of Valance states that he has detected in the mineral 
waters of Neyrac (Ardéche), both titanium and zirconia. He had pre- 
Viously announced his having found in the same waters, molybdenum, 
tin, tungsten, tantalum, cerium, yttrium, glucinum, nickel and cobalt. 
