58 FORMATION OF SHELLS OF ANIMALS, ETC., 
upon the time the slides had been kept in the dense solu- 
tion. ‘The full effect of this mode of experimenting can- 
not be obtaimed without varying the experiment above 
described, especially with respect to the time allowed for 
the globules to be acted upon by the dense solution. But, 
as there given, it will suffice to show some of the effects of 
complete disintegration on the globules composed of triple 
phosphate and globular carbonate. ‘Those composed en- 
tirely of the latter component, which are situated higher 
on the slide, are not in the least affected, however long 
they may have been kept in the dense solution. This 
process of disintegration im the former is first indicated by 
the radiating lines becoming more distinct, especially 
near the margin of the globules. Afterwards separations 
occur between these lines, so that the circumference of a 
globule, in the place of being one sharp line is made up of 
their projecting ends, giving the appearance of a ciliated 
fibrous zone, whose breadth depends upon the degree of 
disintegration. As this process progresses, this zone dis- 
appears in certain parts, leaving the periphery uneven, 
and afterwards it disappears altogether, when the globule 
becomes reduced in size according to the width of the dis- 
