270 
POPULAR SCIENCE REVIEW. 
The results of the analysis are expressed in the following tables : — 
North. 
South. 
Cubic inches. 
Cubic inches. 
Nitrogen 
... 7-4864 ... 
7-9792 
Carbonic acid 
... 4.3-3112 ... 
38-0408 
Mean temperature of the water, 48° 
Grains. 
Grains. 
Carbonate of lime 
... 42-354 ... 
34-846 
Carbonate of magnesia ... 
... 2-844 ... 
3-051 
Carbonate of iron 
... 1-465 ... 
1-996 
Carbonate of manganese ... 
trace 
trace 
Sulphate of magnesia 
... 98-952 ... 
90-992 
Sulphate of lime 
... 69-120 ... 
69-537 
Sulphate of soda 
... 7-060 ... 
2-015 
Chloride of sodium 
... 19-287 ... 
19-540 
Chloride of potassium 
... 3-002 ... 
2-416 
Chloride of magnesium ... 
... 1-941 ... 
0-920 
Silicic acid 
... 0-859 ... 
1-063 
Organic matter, &c.‘ 
... traces 
traces 
246-884 
226-376 
Sp. gr. of the water 
. 1-0033069 
1-0028378 
A process for the preparation of silicated hydrogen in considerable 
quantities has lately been brought into notice. Dr. Martius has been 
engaged in making metallic magnesium by reduction of the chloride with 
sodium ; for this purpose he employed an earthen crucible, and on ex- 
amining the product he found that it contained silicium, and gave off 
inflammable gas during solution in hydrochloric acid. By introducing 
larger quantities of silicium he was able to prepare the gas in a state 
of greater purity ; it possesses, like phosphoretted hydrogen, the singular 
property of spontaneous inflammability. 
It is generally stated, in books on chemistry, that camphor has a tendency 
to deposit towards the light, by which it is meant, that if a bottle containing 
camphor be exposed to sunlight, the camphor will be deposited in crystals 
on that part of the bottle which is turned towards the light. Mr. C. Tom- 
linson’s experiments however have led him to the conclusion that heat, 
not light, is the cause of the phenomena observed. He exposed a great 
number of bottles of camphor to light under different circumstances (for 
instance, when immersed in water), and found that no deposit was formed 
under those conditions that prevented a radiation of heat. 
II. Applied Chemistry. — A patent has been recently taken out by 
Mr. James Webster, for a process for making oxygen gas from nitrate of 
soda, and at the same time obtaining certain other valuable products. The 
process consists in heating a mixture of the nitrate with oxide of zinc in 
retorts; the nitric acid is decomposed by the heat into oxygen and nitrogen, 
the soda remaining behind, is separated by v r ater from the oxide of zinc. 
It is proposed to employ the oxygen in metallurgical operations, and for 
