Inlelligencc and Miscdlanics. 387 



the character of the vegetable kingdom in the Indian Archi- 

 pelago. 



The session was closed by a speech of the President's, 

 and it was decided that the Congress should be convoked 

 the next year at Heidelburg. — Rev. Enc. Jiov. 1828. 



34. On the detection of Potash by the oxide of M'ckel. — 

 As the method of Harkorts for the detection of potash is 

 but little known to chemists, and as it promises great advan- 

 tages, especially in mineralogy, we think it right to state 

 what Berzelius says of it in the new edition of his treatise 

 on the blow pipe, about to appear. According to this che- 

 mist, the method of Harkorts has answered perfectly to the 

 trials to which he had subjected it, to ascertain its correct- 

 ness. It is sufficient to dissolve the oxide of Nickel in bo- 

 rax, and to add to the vitreous matter a little nitre, feldspar, 

 or any potassuretted substance, to obtain immediately a 

 glass of a very distinct blue color. The presence of soda 

 does not prevent this reaction. Among the preparations of 

 Nickel, we may employ the nitrate or oxalate of this metal. 

 It must not however contain cobalt, as that gives the glass 

 a brown color. — Ferrusac's Bull. Juillet, 1828. 



35. Description of a very simple Apparatus for saturating 

 any liquid with gas and zoithout loss of the fluid, by M. Hes- 

 sel. — The gas is to be enclosed in a bladder, which is to be 

 connected by a hollow cylinder with an elastic tube, (a gut, 

 or something of that kind.) This tube is to be adapted to 

 a bottle containing the fluid to be impregnated, and which is 

 not to be quite full of the liquid In the neck of the bottle 

 adjust a cork pierced with two holes, into one of which fas- 

 ten a tube, which shall pass downward into the fluid, and 

 over the hole place a valve opening upwards. 



When the bladder is pressed, the gas passes through the 

 tube into the fluid, and rising to the top, it ascends through 

 the valve to be again pressed downwards into the fluid, until 

 the absorption is complete. — Ibid. 



36. Memoir on the Chloride of Lime, by M. Morin, Ann de 

 Chimie and de Phys. Fev. 1828. — The author, in saturating 

 hydrate of lime by gaseous chlorine, has found the following- 

 results. 



