Chemical Science. 167 



mination of the means which are, or may be, adopted for the 

 preservation of fresh water at sea, gives the preference to the 

 following : 1^ parts of oxide of manganese in powder is mixed 

 with 250 parts of water, and agitated every 15 days. In this 

 way water has been preserved unchanged for seven years. 



The editor of the Annales de Chimie observes, that oxide of 

 manganese has the power, not only of preserving water, but of 

 rendering that sweet which has become putrid ; but he also 

 points out the important circumstance, that the oxide is slightly 

 soluble in water, and therefore recommends the use of iron tanks 

 for the water, as in England. 



11. Analysis of Sea Water. — According to an analysis of 

 sea-water from the Coromandel coast, made by M. Plagne, 

 professor of chemistry, 8fc., it would appear to contain the fol- 

 lowing proportions of substances. 



Carbonic acid 0.000033 



Muriate of magnesia 0.009280 



Muriate of soda 0.023100 



Sulphate of lime 0.001064 



Sulphate of magnesia 0.001524 



Sub. carb. of magnesia 0.000140 



Sub. carb. of lime 0.000060 



Animal mucus 0.000030 



0.035281 

 M. Plagne searched diligently for nitrate of potash, but was 

 not able by any means to detect its presence. 



12. Titanium in Iron Ores. — M. Robiquet has lately examined 

 the oxidulatcd octoedral iron, from the steatite of Corsica, and 

 has found it to contain a considerable portion of titanium. It 

 dissolved completely in muriatic acid, but the solution, evapo- 

 rated to dryness at a moderate heat, and re-dissolved in water, 

 left a white pulverulent substance, which, when fused with 

 potash, and afterwards dissolved in muriatic acid, gave all the 

 characters of a solution of titanium. In this way, six parts have 

 l)etn separated from 100 of the mineral. M. Robi(luet is in- 



