190 



the pole of a magnet, which produced rotation, and on bringing it 

 near enough, a depression of the mercury above the pole. The above 

 phenomenon appeared, independent of any elevation in the tempera- 

 ture of the mercury, nor can it be attributed to electric repulsion. 

 It must be referred to forces producing motions in right lines, or un- 

 dulations from the surfaces of the wires as a centre ; and it seems, 

 says the author, strongly opposed to the idea of the electro-magnetic 

 results, being produced by the motion of a single imponderable fluid. 



On Fluid Chlorine. By M. Faraday, Chemical Assistant in the Royal 

 Institution. Communicated by Sir Humphry Davy, Bart. Pres. 

 R.S. Read March 13, 1823. [Phil. Trans. 1823, p. 160.] 



By exposing the solid hydrate of chlorine, hermetically sealed up 

 in a glass tube, to a temperature of about 100, the chlorine is evolved 

 from it under such pressure that it assumes the liquid form, appear- 

 ing of a bright yellow colour, and sinking in the warm water with- 

 out showing any tendency to mix with it till the temperature fell 

 to about 70, when the whole re-assumed the appearance of solid 

 hydrate. The liquid chlorine, in its pure form, did not congeal at 0, 

 and it instantly assumed its usual elastic form upon removing the 

 pressure to which it was subjected. By condensing dry chlorine by 

 means of a syringe into a glass tube, Mr. Faraday succeeded in con- 

 verting a portion of it into a liquid, under a pressure of about four 

 atmospheres. 



The specific gravity of liquid chlorine he considers to be about 

 1-33. 



In a note attached to this paper Sir Humphry Davy announces his 

 having succeeded in obtaining muriatic acid in a liquid form, by 

 causing sulphuric acid and muriate of ammonia to act upon each 

 other in a strong sealed tube. The gas thus gradually liberated 

 under pressure, condensed into an orange-coloured liquid, lighter 

 than sulphuric acid, and instantly assuming the elastic state when 

 the tube is broken. 



Sir Humphry suggests the probability of other gases being con- 

 densed into the liquid form by a similar method of condensation 

 under pressure; and points out the advantages which this mode pos- 

 sesses over a sudden mechanical pressure, and condensation by ex- 

 posure to cold. 



On the Motions of the Eye, in illustration of the Uses of the Muscles 

 and Nerves of the Orbit. By Charles Bell, Esq. Communicated 

 by Sir Humphry Davy, Bart. P. R.S. Read March 20, 1823. 

 \Phil. Trans. 1823, p. 166.] 



The author of this paper has entered into an examination of the 

 external apparatus and muscles of the eye, with the view of explain- 

 ing the necessity of six nerves being given to the parts contained in 

 the orbit. 



