Intelligence and Miscellaneous Article'^, 85 



posed, and converted into mucilaginous matter, while the lime is 

 precipitated in the state of carbonate, and crystallized in very acute 

 rhomboids. .M. Becquerel obtained the same crystals, under the 

 influence of weak electrical currents; and as he operated without 

 the contact of air, the decomposition of sugar was undoubtedly 

 effected, under the circumstances in which it was placed. 



M. Pelouze concludes from new experiments which he has made 

 on this subject, that when the mixture is exposed to the air, the 

 sugar is not decomposed, and that the crystals which are produced, 

 result from the action of the carbonic acid of the atmosphere upon 

 the lime ; and the carbonate forming slowly in a fluid, is deposited 

 with water of crystallization. It contains 5 atoms of water ; at 

 about 86° of Fahrenheit it loses its water of crystallization and 

 becomes pasty ; but what is very remarkable is, that the salt which 

 is perfectly dehydrated at 86° when it is in water, loses only 2 

 atoms when it is heated in strong alcohol at a boiling heat. The 

 new salt containing 3 atoms of water is efflorescent in the air, 

 while that with 5 atoms undergoes no alteration. — Journal de Phar- 

 niacie, April 1832. 



19''- EXTEMPORANEOUS SOLUTION OF CHLORINE. 



M. Tourtois gives the following quantities of ingredients for ob- 

 taining a solution of chlorine, which are to be added to an imperial 

 quart of water and well shaken together in a stopped bottle; and 

 he remarks that unless the deutoxide of lead be finely powdered, 

 some of it will remain undecomposed : — 



Sulphuric acid 910 grains 



Common salt . . . • 280 



Deutoxide of lead 84-0 — Ibid. 



As, however, 280 of common salt contain 112 of sodium, requiring 

 nearly 38 of oxygen for conversion into soda, and as 116 of deut- 

 oxide of lead give out only 4 of oxygen by reduction to protoxide, 

 it will appear by calculation that 1102 grains of red-lead should be 

 used with 280 of salt, instead of only 840. The sulphuric acid must 

 be equivalent to 150 of soda and 1064 of protoxide of lead, or 

 about 700 grains, instead of 910 — R. P. 



SEPARATION OF PEROXIDE OF IRON FROM PROTOXIDE OF 

 MANGANESE. BY M. LIEBIG. 



When carbonate of lime is boiled with a solution of peroxide of 

 iron and protoxide of manganese, llie former is precipitated, and the 

 latter remains in solution j the separation is so complete that no trace 

 of iron remains in solution, nor is any manganese precipitated. 



Carbonate of magnesia may be employed for the same purpose. 

 To determine the precision of this method, one part of protosulphate 

 of manganese was mixed with forty parts of protosulphate of iron, 

 and mixtures were niiide in inverse proportions ; after having per- 

 oxidized the iron by nitric acid, the solutions were boiled with car- 

 bonate of magnesia. 



