BY MOLECULAR COALESCENCE, 29 
coalescence is complete and all the molecules of the 
lateral spheres have become collected into the central 
one, its superficies will be made up entirely of molecules 
which had before been contained in the superficies of the 
component spheres. And as the same reasoning will apply 
to the next and all the subsequent laminz, it is obvious 
that the greater part of the molecules which had occupied 
any given position relatively to the centre of each of the 
component calculi, will be similarly placed with respect to 
the centre of the aggregate calculus. If the two compo- 
nent spherical caleuli be similarly laminated, as repre- 
sented in Fig. 3, a and 4, it will be apparent, on inspection 
of these figures, that at the contiguous extremities of 
any two laminz similarly situated in the two coalescing 
spheres the molecules of each lamina will be under the 
same mechanical conditions; that is, the attractive forces, 
acting upon the two apposed molecules in the directions 
of the centres of both spheres, will, as these molecules 
shift their place, be always exerted with the same intensity 
upon the one as upon the other. So that when the coa- 
lescence of the spheres is completed, and there is conse- 
quently only one centre, these two molecules will le side 
by side, equi-distant from it, both being in an arc of the 
same circle. In the same manner all the other lamine 
will become united, and the two spheres so completely 
incorporated as to leave no vestige apparent of their 
former individuality. If one of the coalescing globules 
is very much smaller than the other, so that their lamine 
cannot coincide, they will still become blended together, 
but their molecules about the parts of junction will for 
some time at least have no definite arrangement. 
Besides the arrangement of the molecules of these cal- 
culi mto laminz, as above described, there is also an 
