cientific Intelligence . 
IT. On the difference between Sea and Land Air. — Having 
learned that on the Baltic asthmatic invalids were much better 
at sea than on shore, M. Vogel analysed the air a league from 
the shore, and concluded, 1. That the air above the Baltic, a 
league from the shore, contains less carbonic acid than the ordi- 
nary atmosphere, and carbonic acid probably diminishing as 
we recede from the land ; and, 2. That the same air contains 
muriates in greater or lesser quantities. — Journ. de Pharm. 
Oct. 1821. 
18. Berzelius's Analysis of Crystallised Calamine cffLimhourg. 
This mineral, the electric oxide of zinc, was found to contain 
Silica, 
Experiment. 
24.-9 
Theory. 
26.23 
Oxide of Zinc, 
66.84 
66,37 
Water, 
7.46 
7.40 
Carbonic Acid, 
0.45 
— 
Oxide of Lead, 
0.28 
100.00 
99.93 
19 Count D'OhssonbS Analysis cff Chcmdrodite. — This new 
mineral is found near Pargas in Finland, interspersed in granu- 
lar limestone. It occurs in grains the size of a pin-head, and is 
of a wine-yellow colour. Spec, gravity, 3.18. Its ingredients are. 
Silica, 
38.0 
Magnesia, 
54.0 
Oxide of Iron, 
* 5.1 
Alumina^ 
1.5 
Potash, 
0.86 
Manganese, 
a trace. 
99.46 
20. Mr Irvines Analysis of the Foliated Sidphato-Carhmiate 
cf Lead *. — 100 Grains of the foliated Sulphato-carbonate of 
Lead were treated with dilute nitric acid ; a brisk effervescence 
took place, attended by the deposition of a white powder, which 
appears to be sulphate of lead. This powder, on , being sepa- 
rated by the filter, weighed - - - 29 grains. 
The lead in the nitric solution was precipitated by 
sulphuric acid, and when filtered, weighed 73 
102 
See our last Number, p. 183. 
