203 
that the nature of the gaseous medium in the case S L G ex- 
erts any appreciable or definite influence upon the drop-size. 
Taking glass for the solid and water for the liquid the medi- 
um was changed from air to nitrogen, hydrogen and carbonic 
acid respectively. The exceedingly slight alteration wrought 
by this change in the drop size may probably have been due 
to the different solubility of the gases in water and the con- 
sequent alteration in the cohesion ot that liquid. 
Having traced the effect of variation in the conditions 
which determine the size of a drop in the general case SLG : 
or, where from a Solid, a Liquid drops through a Gas : we 
come to the case SLL, that is where, from a Solid, a Liquid 
drops through a Liquid. As in the cases of SLG we must, 
here also, take the three terms of such chemical nature as to 
be without action upon one another. 
SLL 
MOM A SOLID A LIQUID DROPS THROUGH A LIQUID. 
A preliminary quantitative experiment was made under the 
following conditions. Water was made to drop from a glass 
sphere at the rate gt.=o”. The drops were collected in a 
tube bearing an arbitrary mark. The number of drops re- 
quired to fill the tube up to this mark was noted. Then the 
sphere was surrounded by turpentol and the rate having been 
brought again* to gt.= 6”, the number of drops of water 
necessary to fill the tube up the same mark was counted. 
The turpentol being replaced by benzol, the same operation 
was performed. The entire arrangement of the Stalagmome- 
ter f is seen in fig. VII. 
X, Y are contrivances described before for giving an uni- 
form flow of water. 
The syphon A rests upon the cotton wool covering half of 
the dropping sphere and thermometer bulb G. The sphere is 
* A diminution of gt. is observed, 
f Swlagmos, a drop. 
