BY MOLECULAR COALESCENCE. 65 
have the ordinary characters, but those formed of particles 
from both solutions will differ considerably. Some will 
retain the form which they had on removal from the first 
bottle, but their transparency will be impaired, partly 
by the addition of fresh particles, partly by their former 
molecules having become confused and made to present 
a dusty appearance; some will appear distinctly lami- 
nated, the laminz being separated by dark amorphous 
Imes; a third set appear to be globular instead of flat, 
and to be filled with air and amorphous molecular 
matter. Several of each kind will be seen in different 
stages and degrees of disintegration, mouldermg away 
as it were; and of a few merely circular circular traces 
will be left on the glass, almost invisible under ordinary 
illumination, but by polarized light distinct, exhibiting 
cross, but no colour, excepting a very faint blue. In this 
ease the disintegration is not confined to the calculi com- 
posed of a mixture of triple phosphate and globular 
carbonate, but it affects equally those composed of the 
latter compound, whether large or small. Now, on con- 
sidering the conditions of this experiment, and comparing 
them with those of the preceding ones on molecular dis- 
integration, it will be obvious that these effects can only 
have been produced by one cause, and therefore admit 
only of explanation on one principle. Difference in den- 
sity of the solutions in which the perfectly formed glo- 
bules were immersed, as in the first experiment, can have 
had no share in producing it, any peculiarity in the com- 
position of these globules, as in the second experiment, 
can have had nothing to do with it. And as the solutions 
were, in both stages of the process, exactly of the same 
composition, these changes in the structure of the glo- 
bules after the second immersion are not the effects of 
5 
