— 309 — 
The salient points of Table XVI are chiefly these : 
(1) The drop-size of a liquid which drops under like con- 
ditions through various media , does not depend wholly upon 
the density of the medium and consequent variation in the 
weight, in the medium, of the dropping liquid. Thus glycerine 
whose density is above that of all the other liquids examined, 
does not, as a medium cause the mercurial drop to assume 
either its minimum or maximum size. 
(2) The liquids in TablejXVI are in the same order as in 
Table VIII. Jn other words. If there he two liquids A and 
B which, drop under tike conditions through air ; and the drop 
size of the one A be greater than that of the other B, th'en, if 
a third liquid C be made to drop thrrugh A and through B 
the drop size of C through A is greater than the drop size of 
C through B. 
(3) Further, on comparing Tables XIV and XVI it ap- 
pears that whether Avater or mercury drops through turpentol 
and benzol ; the drop through benzol is greater than the drop 
through turpentol. This avc shall aftenvards find confirmed 
in other instances into the Luav : If the drop-size of A through 
B be greater than the drop-size of A through C then the 
drop-size of D through B is also greater than the drop-size 
of I) through C. 
It is further observed that while mercury exhibits its larg- 
est drop when falling 'through air, water assumes its smallest 
drop size under this condition. 
This method of the examination of liquids by drop size 
which brings so prominently fonvard or comparatively slight 
difference between similar liquids may be used not only to 
detect commercial adulterations of one liquid by another, but 
perhaps to distinguish betAveen those remarkably related iso- 
meric liquid bodies, the number of which is quickly increas- 
•ng; and between Avhose terms the difference has until lately 
escaped detection. Of these bodies the first studied were the 
tAVO amylic alcohols ; but the greatest number at present 
knoAvn is amongst ^thejiydrocarbous. 
