318 Proceedings of the British Association. 
paper is rendered quite insensible by being washed over with the 
above hydriodic solution, 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 Schénbein, by 
Mr. F. De Moleyns. The statements made by Prof. Schénbein 
at the Glasgow meeting (see Vol. xxi, 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. 8. 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 fiuid ; 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 Jess eastly oxidable metals: 2, that by cer- 
tain arrangements, all metals, when positive electrodes, may be 
made to develope the odoriferous principle : 3, that certain posi- 
tive metals, not acting as electrodes, will evolve this principle: 
A, 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 Schénbein, which he proposed 
