1040 
de Fraine.—On the Structure and 
mechanical pressure ; 1 he was unable to trace a genuine case of re-fusion 
of a ‘ meristele 5 with a stele. 
As neither of the meristeles a or / 3 , which have hitherto been considered, 
give really conclusive evidence of the breaking up of the c meristeles ’ into 
foliar strands, for this purpose the changes undergone by the remaining 
‘ meristele \ y, will be described. The £ meristele ’ y is a vascular mass 
lying on the remaining free side of the stele M and almost equalling it in 
Text-fig. 9. Tracings showing the breaking up of the meristele 7. Slightly under nat. size. 
A slight restoration has been necessary in Sections XLIV-L. 
size (PI. XCI, Fig. 1 ), giving the stem the appearance of having two almost 
equal steles in the lower half of the series, but that y is only a large c meri- 
stele * and not a stele is abundantly proved by its subsequent behaviour. 
The primary wood in this ‘ meristele ’ occurs in two masses, one at 
either end, and the secondary wood extends completely to the middle 
in the central region. In Section O a small strand of primary wood shows 
evidence of detachment, 2 in XVIII it begins to pass outwards through the 
1 Loc. cit., p. 52. 3 Shown still more clearly in Plate XCI, Fig. 1. 
