70 ON THE MODE OF ACTION OF THE GALVANIC PILE. 



which, on account of my design to make geological obser- 

 vations in various parts of Germany, I had left unfinished, 

 in hope that this process would be followed by some experi- 

 mental philosopher ; which however has not been the case, 

 and a paper on On my return to Windsor, where I had resumed this rich 

 gavam>m. analysis, I saw, in Part I of the Phil. Trans, for 1807, a 

 Bakerian Lecture of Mr. Davy, On some Chemical Agencies 

 of Electricity, read the 20th of Nov. 1806; in which, inter- 

 mixed with very ingenious experiments and important dis- 

 coveries in practical chemistry, I found some principles laid 

 down as foundations of a theory* which had already been op- 

 posed by the experiments related in the last of the above- 

 mentioned works, deposited in the Royal Society's library 

 the beginning of the same year. This engaged me to follow 

 more closely the analysis which I had resumed, and, having 

 completed it, I wrote a paper on this subject, which was 

 presented to the Royal Society the 30th of May, 1808. 

 This abridged. Having heard that this paper had not been read, and be- 

 ing told, that it was on account of its length, I took an op- 

 portunity of seeing Sir Jos, Banks at Windsor in the begin- 

 ning of 1809, to beg of him, that th}3 paper should be sent 

 back to me, in order that I might contract it, which he did 

 very obligingly. One of the abbreviations that I adopted 

 was to suppress the application of my experiments to Mr. 

 Davy's theory ; and by this and other omissions, having re- 

 duced my paper to twenty-three pages, I sent it again to the 

 Royal Society the 25th of Feb. 1809. 

 Chemical ef- One of the important results of the experiments con- 

 fers of the pile gained in this paper is, that, in the Galvanic Pile, the che- 

 ieparable from f , _ ■ l • • '«'«.•''* , • , i , 



the electrical, mical effects can be separated from the electrical; and that 



New meteoro- the latter lead to a new meteorological instrument, very 



logical mstru. desirable for the knowledge of atmospheric phenomena. 



This object I followed subsequently to the first presentation 



of my paper, and on the 7th of March 1809, I presented to 



the Royal Society another paper under this title : On the 



Electric Column, avid Aerial Electroscope. 



Publication of Tie following summer, I received a letter, dated from 



the papers de- fa £p ar t men t s f the Royal Society the 6th of July, signed 



Ruyal Society. Humphry Davy, S. R. S. Saying: that the Committee of 



Papers, although they did not think it proper to publish my 



papers 



