Polytechnic Association Proceedings. 561 



POLYTECHNIC ASSOCIATION PROCEEDINGS. 



May 2, 1867. 



Prof S. D. Tillman in the chair; J. "Wtatt Reid, Secretary. 



The followiug scientific memoranda were presented by the 

 Chairman: 



GRAPHTTOIDAL BOEON. 



Wohler has ascertained that this body, originally described by 

 him as pure boron, is a definite compound, consisting of two equiva- 

 lents of boron and one equivalent of the metal aluminum. 



NEW USE OF ELECTRIC LIGHT. 



During a skating fete last winter, the Bois de Bologne was bril- 

 liantly illuminated by means of fifteen electric lights, produced by 

 the use of fifteen batteries, each containing forty Bunsen cells. 



THE PARIS BELT RAILWAY. 



On the 26th of February last, this railway was formally opened. 

 It is twenty-two miles in length, including the branch to Mount 

 Pamasse, and is entirely within the city limits. It crosses the 

 river Seine by two bridges, about seven miles apart. 



HYDROPHOBIA. 



Youatt states that he has been several times cured of the bite 

 of a rabid animal, by rubbing into the wound crystals of nitrate 

 of silver. However, the susceptibility of individuals to venom is 

 so various, that probably no specific will be found for this terrible 

 disease. The nitrate of silver contains, according to the new nota- 

 tion, one atom of silver, one of nitrogen, and three of oxygen; 

 therefore, its name, according to the new chemical nomenclature, 

 explained in our Transactions for 1865, is Argamanit. 



SELr-REGISTEftiNG ANEMOMETER. 



This instrument, invented by Gen. Morin, has been successfully 

 used in ventilating the amphitheater of the Conservatoire des Arts 

 et Metiers, Paris. It has an electric counter which has worked for 



[Inst.] 36 



