Error in M. Schumacher's Tables. — Boron. 63 



production of him and M. Pelletier, entitled Researches on 

 the genus Hirundo. — M. J. J. Meunier announced, in a note, 

 that he possesses the ancient art of painting and burning glass 

 with all colours.— M. Geoffroy Saint-Hilaire presented a work, 

 entitled Synoptic tables explaining the composition of the 

 skull in man and in animals. — M. Latreille communicated 

 an analytical table of the natural families of the animals con- 

 stituting M. Cuvier's division of the Mollusca.— M. Vauquelin 

 read a memoir, entitled A chemical examination of a green 

 substance which is formed on the mineral waters of Vichy. — 

 M. Arago communicated some experiments relative to the 

 oscillations of the magnetic needle. — The Academy named 

 M, Pelletier as a candidate for the chair of Materia Medica 

 vacant at the School of Pharmacy of Paris. — Dr. Lasserre 

 presented a memoir on the operation for the stone. — A me- 

 moir by M. Bonastre on the analysis of the balsam of Canada 

 was submitted to MM. Vauquelin and Dulong. 



Nov. 29.— M. Gaudin communicated a new method of the 

 application of algebra to geometry.— M. Laurencet read a 

 memoir on the structure of the brain.— M. Louyer Viller- 

 met read a Memoir on the number of deaths in France in the 

 middling and poor classes of people. 



W 



XII. Intelligence and Miscellaneous Articles. 



ERROR IN M. Schumacher's tables. 



E are authorized to state that in Professor Schumacher's 

 Astrvnomische IM/stafeln for 1825, tlie declination of 

 8 Urs^e Minaris is set down one minute too nmch, throughout 

 the whole year. 



BORON, ITS PREPARATION, &C. 



The readiest method of obtaining boron, without losing 

 too nuich potassium, is to heat the potassium with fluo-borate 

 of potash. Boron and silicium resemble each other in their 

 properties nearly as sulphur and silicium, or as phosphorus 

 and arsenic. I have produced sulphuret of boron ; a white 

 and pulverulent substance, which dissolves in water, yielding 

 sulphuretted hydrogen gas. Boron burns in chlorine. The 

 chloride of boron is a permanent gas which is decoinposed in 

 moist air, producing a dense vapour; and in water giving mu- 

 riatic and boracic acids. It condenses one and a halt tunes 

 its volume of ammoniacal gas. Bcrzclius—Bib. Vniv. xxvi. 

 277. 



UNICORN". 



