BY MOLECULAR COALESCENCE. 85 
cavity, where they degenerate into mere dots; and, 
furthermore, that their course is sometimes undulating, 
or, where the lamine join, interrupted, this depending 
upon the completeness of the coalescences of the car- 
bonate of lime in the part of the shell examined, 
Fig. 5 a is a representation somewhat diagrammatical of 
a thin section of shell, in which the lamelle and 
Fig. 5 A. 
| rN 
BIN" un 
il TO 
yi Menminel AN m 
: nH AN ne 
Nu | iN ay TL nu 
1 “ a i 
(Sut 
\ \ A am ea na 
Ral 
heh a itt an Si] 
ua oe N “ ie i‘ 
* Sonu ; 
radiating fibres appear as two sets of undulating lines | 
one set, called by the physiologists lines of growth, 
corresponding to the lamell of the artificial globules 
running more or less parallel with the surface, the 
other set corresponding to the radiating lines of the 
artificial globules, passing from one surface of the shell to 
