64 FORMATION OF SHELLS OF ANIMALS, ETC., 
to produce the effects attributed to them. Now it may be 
observed that, as in this case there are no other known 
causes capable of producing such effects, unless it can be 
supposed that vitality has produced them, the simple fact 
itself of their being produced under such circumstances is 
the best proof of their adequacy to produce them. I have 
dwelt longest upon the results of this experiment, as 
probably they will be considered the most remarkable of 
all that have been described, although I must say that 
there is nothing wonderful in the facts here stated respect- 
ing these calculi, or in the explanation of them just 
advanced. It is only what might have been anticipated 
under such circumstances, being only the necessary conse- 
quence of an ordinary and universal cause. 
There is yet one more case of final molecular disinte- 
gration, which differs in some respects from those just 
described. The experiment required for its demonstration 
simply consists in taking two slides from a bottle in which 
they had been kept for three weeks, according to the 
formula and directions given at page 6; and then, after 
removing the carbonate deposited on their upper surfaces, 
and washing the lower ones with distilled water, without 
removing any of the carbonate, introducing these slides, 
with the coated surfaces inclining downwards, into another 
bottle contamimg solutions the same in quantity and 
density as the first, and treated in the same manner, so 
as to have a second deposit on their lower surfaces. After 
a month or six weeks these slides are to be removed from 
the bottle, the carbonate removed from the upper surfaces, 
and the lower ones washed with distilled water, and then 
examined in glycerine or Canada balsam. The globules 
adherent to the lower surfaces of these slides will be of 
various kinds. A few formed from the last solution will 
