184 Scientific Intelligence. 



there is no oxygen, in the interior space within the red flame, as phosphorus 

 and sulphur, though they readily melted, yet never would inflame when 

 placed within it. These inflammable bodies, however, always burned when 

 the flame was blown upon them with a blowpipe, so a9 to supply them 

 with oxygen. The moment the supply of oxygen was exhausted, they 

 were again extinguished. Mr Davies explains the great power of the oxy- 

 hydrogen blowpipe, by stating, that in it the flame, instead of being a su- 

 perficial film of inflammation, is a solid mass of fire. — Ann. of Phil. Dec. 

 1825, p. 447. 



35. Prussian Blue in the Soda of Sicily. In three parcels of soda from 

 Sicily, M. Brandeshas obtained Prussian blue. When he heated the soda 

 with warm water in a white iron vessel, he obtained much more of the 

 Prussian blue than when he dissolved it in a porcelain dish. Arch, des 

 Apoth. ver. 1822, No. 3. p. 215. 



36. Analysis of Benxoin. The following analysis of Benzoin has been 

 given by M. Stoltze in the Berlin Jahrhuch, 1824, p. 55. 



White Benzoin. Brown Benzoin. 

 Yellow resin soluble in absolute ether 

 Brown resin insoluble in ether 

 Pure Benzoic acid 

 Extractive matter 

 Water and loss 



1000.00 990.00 



37. On Rinmann's Green. This colour is an intimate mixture of the 

 protoxide of cobalt and the oxide of zinc, which assumes a very lively 

 green tint, after it has been heated to redness. In order to form this 

 green, suddenly, as if by the eruption of a volcano, mix together two parts 

 of nitrate of zinc, and one part of the subacetate of cobalt, and expose the 

 mixture to a spirit of wine lamp in a glass globe, with a short neck. 

 This mixture soon becomes liqufd, and appears at first of a rose-red co- 

 lour, then purple, then blue. In an instant it inflames, detonates, be- 

 comes dry, and assumes a green colour. The product is scattered upon 

 the vessel in the form of small rolled leaves of tea. Bull, des Sc. Nat., 

 May 1824, p. 292. 



38. Oxalic acid found in great quantities in lichens, fyc. M. H. Bracon- 

 not has discovered that oxalate of lime forms nearly one-half of the weight 

 of a great number of lichens, to which it bears the same relation that car- 

 bonate of lime does to corallines, and phosphate of lime to bones. The 

 oxalate diminishes progressively in the family of lichens, as the species 

 loses their crustaceous granular texture, and acquire a foliated mem- 

 branaceous aspect, but the latter still contain a remarkable quantity. 

 About 17 parts of yellowish white oxalic acid were obtained from 100 

 parts of the pulverised lichen. Ann. de Chim. xxviii. p. 318. 



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