49 
which, as the drops become still smaller, their effect will 
begin to diminish, at first slowly, but in an increasing ratio, 
tending towards that of the square root of the diameter of 
the drops. 
This effect may be represented by a curve which coincides 
with the previously described parabola at the vertex, but 
which turns off towards the axis, which it finally approaches 
as a straight line. 
This completes the investigation, so far as I have been 
able to carry it. The complete mathematical solution of the 
equations of motion does not appear to be possible, as they 
are of a form that has not as yet been integrated. However, 
so far it appears to me to afford a complete explanation of the 
two phenomena, and further to show, a fact not hitherto 
noticed, that for any note of waves of sound there is a certain 
size of drop with which a fog will produce the greatest 
effect. 
“The Chemical Constitution of Bleaching Powder,” by 
C. SCHOKLEMMER. F.R.S. 
In his classical research “ On the Compounds of Chlorine 
with Bases,” ^ Gay Lussac has shown that the bleaching 
compounds formed by this reaction are not direct combina- 
tions of chlorine and a base, as Berthollet believed, but that 
a hypochlorite and a chloride are produced simultaneously, 
according to the equation 
2KOH + Cb = KOCl + KCl + H^O. 
When to the compounds thus formed a small quantity of 
a mineral acid is added, hypochlorous acid is set free, whilst 
by adding the acid in excess chlorine is obtained; be- 
cause in the latter case the hydrochloric acid acts on the 
hypochlorous acid in the following way ; 
CIH + CIOH-CL + HA 
* “ Comptes Eendus,” XIV. 927, 
