126 On some neiu Electro-chemical Phcprnmeng. 



than the negative, and the flame and smoke of the phosphofu* 

 were powerfully directed upon it. I conceived, therefore, tha» 

 the flame of the candle was attracted bv the negative pole, ia 

 consequence of the carbon and hydrogen in which it abounds,, 

 and that the rapid fonnation of acid matter during the combus- 

 tion of the phosphorus was the cause of its attraction towards 

 t!ie positive pole : in short, that the appearances were consistent 

 with the known !a>vs of electro-chemical attraction. 



To ascertain the correctness of this idea, it became necessary 

 to examine the pha-nomena with greater precision, and to insti- 

 tute the more extended series of experiments^ which, with their 

 results, I shall proceed to detail. 



The apparatus employed consisted of two insulated brass balls 

 capable of being brought near to, or removed from, each other, 

 Avith a small table between them, as represented in the annexed 

 drawing. (PI. II.) 



When it was necessary to ascertain the relative temperatures 

 of the balls with accuracy, I made use of the instrument, fig. 3, 

 devised by Mr. Pepvs, in which n a rejiresent two thin spheres 

 of brass containing delicate thermometers, the bulbs of which^ as 

 well as the interior of the spheres, were coated with lamp black, 

 to render the increase of temperature more evident. One of the 

 balls was connected with the negative, the other with the positive 

 conductor of a small electrical machine of Mr. Nairne's con- 

 struction, as represented in fig. 2, so that the apparatus v/aa 

 perfectly insulated. 



§ ni. 



Exp. 1 . A small stream of olefiant gas was burned between 

 tfie bails. The flame was evidently attracted towards the nega- 

 tive side. The combustion was continued for one miimte. At 

 the commencement of the experiment, the mercury in the ther- 

 mometers stood at 60° Fahrenheit ; at its termination the posi- 

 tive thermometer indicated 62°, the negative 72". 



2. The experiment was repeated with sulphuretted hydrogen : 

 the flame was now only slightly attracted by the negative ball, 

 but the sulphureous acid vapour passed off towards the positive 

 surface. 



in this experiment the jiositive thermometer rose 3° and the 

 negative thermometer 6° in one minute. 



3. A very small flame of pliosphuretted hydrogen was slightly 

 bent towards the positive pole. In one minute it produced an 

 effect upon the positive thermometer =5°, upon the negative 

 = 3". Wiien a larger flame was used, it appeared equally drawn 

 towards the two electrical poles, but the acid vapour passed off 

 in the direction of the positive ball. 



4. The 



