simply laid upon it from the beak of the dropping tube. pa 
former strikes the medium with the acquired momentum, ga 
the sides are relatively retarded by the resisting action of t 
contiguous fluid. Under these conditions, the force’ brought ne 
play and their resulting motion must evidently be the same | 
in the case of an impulsive discharge of liquid from the immerse 
beak of the pipette. cea ee 
In the other case, that is, where the drop is simply laid egies 
the liquid plane, the gravity of the matter of the drop an Ki 
tension of the curved surface unite in giving a downward imp = 
sion to itscontents. At the same time, the surface of contact bes 
the fluid beneath, forming, as it were, a rapidly enlarging cireu t 
perture, secures the symmetry of the moving mass. This, ie 
_ advances, will of course be subject to the same moulding ac poe 
of the impulsive and retarding forces which has just been 
and which, as we have seen, im 
eir identity of structure 
