We have satisfied ourselves, by direct experiment, that a mixture of
ozone and hydrofluoric acid produces none of the reactions described
above.
It is the same with gaseous hydrofluoric acid. Finally we may add that
the hydrofluoric acid employed, as well as the hydrofluorate of
fluoride, were absolutely free from chlorine.
The gas obtained in our experiments is therefore either fluorine or a
perfluoride of hydrogen.
New experiments are necessary to settle this last point. We hope soon
to lay the results before the Academy.--_Comptes Mendus_, vol. ciii.,
p. 202, July 19, 1886; _Chem. News._
* * * * *
COHESION AND COHESION FIGURES.[1]
[Footnote 1: Notes from a lecture given to the Halifax Scientific
Society, July 19, 1886.]
By WILLIAM ACKROYD, F.I.C.
_1. A Law of Solubility._
It is customary to regard cohesion as the force which binds together
molecules of the same substance, and in virtue of which the particles
of solids and liquids are kept together, and also to speak of the
attraction exerted between particles of two different bodies as
adhesion. The distinction between cohesion and adhesion is a
conventional one. The similarity, if not identity, of the two forces
is demonstrated by the fact that while cohesion is exerted between
particles of the _same_ body, adhesion is exerted with most force
between particles of _allied_ bodies.
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