on the Vapour of Sulphuric Ether. 449 



burns tranquilly and in all respects like a mixture of nitrous 

 gas and hydrogen, having an increased illuminating power, 

 and of a green colour. 



Equal parts of the ethereal vapour and nitrous oxide burnt 

 with a flame resembling the last in colour, but the ignition was 

 rapid and approximating the explosive range. 



The vapour does not seem to diffuse in olefiant gas, — this 

 last burning with its usual illuminating effect, and it is suc- 

 ceeded by a blueish flame, such a one as seemed to be charac- 

 teristic of the vapour. 



The ethereal vapour poured on chlorine gas in day light, 

 gives rise to the immediate formation of clouds of muriatic 

 acid gas, accompanied by the exhalation of a kind of spray 

 from the bottom of the vessel. 



Equal volumes of sulphuric ether vapour and ammoniacal 

 gas burn tranquilly to the end, with reddish green flame. 



Equal volumes of vapour and cyanogen diluted the flame, 

 and made it apparently more luminous. 



Equal parts by bulk of the vapour and sulphuretted hydro- 

 gen burn with a lambent blue flame: little sulphur is de- 

 posited, and the combustion gives rise to the odour of garlic. 



It inflames on the surface of naphtha, water, &c. Poured 

 on the surface of nitric and muriatic acids, it burns with slight 

 alteration of tint. 



On ammonia in solution the flame has a reddish tint. The 

 combustion from the surface of sidphuric acid is more rapid, 

 somewhat of an explosive kind, and the flame is of a red cast. 

 Oct. 7, 1822. J. Murray. 



P.S. Gold-lea/was immersed in the vapour of sulphuric ether, 

 and allowed to repose for four weeks, without any perceptible 

 change having been superinduced. Thin slips of caoutchouc 

 exhibited no alteration whatever in eight days: a small quan- 

 tity of distilled water was at the termination of this period 

 added. In some days the slips were slightly blanched, the 

 edges being most whitened. In the change here produced 

 there seenaed an approximation to the consistency o^ leather, 



I shall only take leave to add, that the thin slips of caout- 

 chouc referred to were obtained by inflating, by means of 

 a condenser, small bottles of Indian rubber in the way de- 

 scribed by Mr. Forster. — I have thus expanded bottles of caout- 

 chouc, from the size of a walnut to the diameter of six inches 

 and more. I have found strips of the caoutchouc so extended, 

 admirable valves for the condenser of my gas blowpipe." 



XCII. True apparent Right Ascension of Dr. yiMiKY.i.\-^v.'s 

 3G Stars fur everij Day in the Year 1 823, at the time of 

 passing the Meridian of Greenwich. Caladatedfrom Bes- 

 sEi.'s Tables of 1 820. 



Vol. 60. No. 296. Z^ff. 1822. 3L 1823. 



