— 211 — 
TABLE XVII. 
Through 
Air 
T 
bt 2 
BT 
B‘2 T 
B 
102 
51 
38 
34 
31 
14 
102 
51 
37 
34 
31 
14 
101 
50 
38 
33 
31 
14 
49 
Mean 
101.7 
50.2 
37.7 
33.3 
31 
14 
Hence a difference of 16.(1 per cent in one of the constituents 
corresponds to an observed difference under the most un- 
favourable conditions of 3 drops. In other words the 
stalagmometer is sensitive to an alteration of 6 op. By 
increasing the capacity of the recipient it is clear that the 
drop numbers and therefore their differences might be in- 
creased at pleasure. Thus by counting the number of drops 
necessary to fill a volume 6 times the si/e we could tell to 
within one per cent bow much turpentol and how much 
benzol were present. 
But it is perhaps in the cases of the still more proximate 
identity mentioned above of isomeric bodies that the stalag- 
mometer may be used rather as a stalagmoscope, to render 
a difference of drop-size evident, than to measure it. 
From Table XVII we gather the general law concerning 
three liquids which are insoluble in and without chemical 
action upon one another. If a liquid A drop under like con- 
ditions in succession through two liquids B and C, then its 
drop-size through any mixture of B and C is intermediate 
between its drop size through B and its drop size through C 
and the greater the proportion of q in the mixture, the more 
nearly does the drop size of A through the mixture approach 
to the drop size of A through ^ alone. 
We have already examined the influences on the drop size: 
in theca.se s L (! of the density of (he dropping liquid. 
