— 198 — 
Although there is only slight difference between the conse- 
cutive terras of column 3, yet between the extremes of Anti- 
mony and Tiu, a well-marked difference exists. 
This table shows that the drop size stands in no simple rela- 
tion either to the equivalent, density, or chemical character of 
the solid : and establishes the existence of a specific adhesion, 
independent of these. Although the differences of table XI 
may be partly owing to the difference of density of the so- 
lids, cork, glass and brass, yet we see from XII that there is 
about half as great a difference between the sizes of drops from 
Antimony and Tin as between those from Cork and Brass : 
although the difference of density between the first two is 
small compared with that between the last. Again, Sulphur 
gives rise to drops intermediate between those of Antimony 
and Cadmium. 
Without therefore venturing to assert that density is with- 
out influence on drop-size it is clearly proved that it does not 
exert the most powerful influence. 
We have finally to examine the direction and extent of al- 
teration in drop- size caused by change of temperature. A 
change in the temperature of the dropping liquid may affect 
the drop-weight without altering the drop-size, by altering 
the density of the liquid. It may further alter the drop-size 
by altering the size and therefore the curvature of the solid. 
Any error introduced by the first of these sources is elimi- 
nated by dividing the observed weight by the specific gravity 
at the proper temperature as in the case of different liquids at 
the same temperature : Errors from the second source may 
be certainly safely neglected, being far within the errors of 
observation. 
In the place where these experiments were made the range 
of natural atmospheric temperature is very small. From the 
coldest to the hottest season the difference scarcely exceeds 
10° C. This circumstance made an extended and minute 
study of the influence of temperature impossible : by prevent- 
ing more than one observation at each temperature being made. 
