3 18 Proceedings of the British Association. 



paper is rendered quite insensible by being washed over with the 

 above hydriodic sohition, and from the photograph thus fixed 

 many copies may be taken. 



Some researches on the development of the Electrical Force, 

 and an inquiry into the nature and properties of the New Ele- 

 ment or product of electrical action described by Schonbein, by 

 Mr. F. De Moleyns. The statements made by Prof. Schonbein 

 at the Glasgow meeting (see Vol. xli, p. 43) respecting the new 

 element which he called ozone, attracted the attention of Mr. De 

 Moleyns ; and the paper now read contained some of the more 

 important results of his experiments. In the report alluded to, 

 Prof. S. states that the disengagement of the " odorous substance" 

 depended, 1, upon the nature of the positive electrodes ; 2, upon 

 the chemical constitution of the electrolytic fluid ; and 3, upon 

 the temperature of that fluid. He added, that his experiments 

 went to show that well-cleaned gold and platina were alone ca- 

 pable of disengaging the odoriferous principle, and that the more 

 easily oxidable metals, as well as charcoal, did not possess that 

 property at all. The results of Mr. De Moleyns's investigations 

 appear to prove : 1, that the disengagement of the peculiar odor 

 is not confined to the less easily oxidable metals : 2, that by cer- 

 tain arrangements, all metals, when positive electrodes, maybe 

 made to develope the odoriferous principle : 3, that certain posi- 

 tive metals, not acting as electrodes, will evolve this principle : 

 4, that charcoal forms no exception to this rule: 5, that all sub- 

 stances, whether crystalline in structure or otherwise, possessing 

 the property of appearing luminous by friction, or of yielding 

 sparks when struck, also possess the property of discharging, un- 

 der such circumstances, the peculiar odor: 6, that iron and nickel 

 develope this principle more strongly than any other metal. Mr. 

 De Moleyns, observing the odor to be produced at the points con- 

 necting an electro-magnetic machine with the battery, construct- 

 ed an apparatus by which magnets were made to revolve within 

 a glass cylinder, which could be exhausted at pleasure, or filled 

 with various gases; by such means he obtained a vacuum, and 

 operated in dry air, collecting the matters evolved over distilled, 

 water, and by such modes he proved that ozone could not only 

 be evolved in a dry atmosphere, but also in a vacuum — mercurial 

 and common. These and other experiments led Mr. De Moleyns 

 to the conclusion that the ozone of Schonbein, which he proposed 



