BY MOLECULAR COALESCENCE. 59 
integrated zone. And thus the disintegration proceeds 
until the entire calculus isremoved. (See fig. 4, 4), which 
accurately represents some of these globules. The disin- 
tegrated molecules, deprived of the whole or a great part 
of their triple phosphate, are dispersed through the solu- 
tion, where some again coalesce, but into much smaller 
globular and oval particles, exhibiting all the stages of 
molecular coalescence described at the begimning of this 
paper, while others reassume a crystalline form. Now, 
in explaining the cause of this fact, I may repeat the ob- 
servation, that no kind of disintegration takes place in the 
globules of simple carbonate of lime on the same slide, 
that is, in those globules, whose molecules are kept to- 
gether in the spherical form by two attractive forces, 
namely, gravity and the attraction of tenacity, but only 
in those globules in which the attraction of tenacity is 
neutralized by the combination of triple phosphate with 
the globular carbonate; and, therefore, it can only be 
with the former of these forces, namely, gravity, that 
the disintegrating cause has to contend; and as the 
conditions of the experiment are such as to exclude the 
action of all other forces upon these calculi, excepting 
that of gravitation, it must follow, of necessity, that 
gravity is the disintegrating agent. And, moreover, as it 
was shown that these calculi are formed by the force of 
gravitation drawing their molecules towards their centres, 
so it must be inferred, that the same force, in producing a 
directly opposite effect on these caleuli—their disintegra- 
tion or destruction—will draw their molecules from their 
centres. In this experiment it is evident that the sur- 
rounding dense medium would act in this manner, attract- 
ing the molecules of these bodies with a force exceeding 
that by which they are attracted by the bodies themselves. 
