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The first class consists of several layers numbering from ten 
to twelve cells in diameter. The first division occurs in the 
second layer under the cavity, anticlinal walls being formed, but 
with no great regularity. Soon afterwards the cells lying about ` 
the circumference of the upper layer begin to divide, forming new 
walls in such a manner as to change the rectangular shape of the 
lower portion of the cavity, that is, the angles or corners become 
filled with cells and the whole cavity assumes the oval form which 
it has at maturity. From this time on the several layers below 
the ovary divide rapidly by the formation of anticlinal walls; the 
cells so derived constitute the pith. 
It will be understood from the nature of the case that the 
second part of the meristematic cluster, or that giving rise to the 
bundle cylinder, consists of the elements of the bundles already 
present. These bundles form an almost unbroken ring around 
the cavity of the ovary and have already been described as extend- 
ing through it to its extreme tip. It is easy to determine what 
part of the bundles is in a formative or meristematic condition by 
the immature appearance of the ducts and the extremely thin 
walls of all the other cells. Owing to the irregularity in the order 
of division of the cells forming the central cylinder it is not possi- 
ble to say definitely that the meristem of the bundle coincides in 
depth with that giving rise to the central cylinder. It is, however, 
highly probable that such is the case. 
The third part of the meristematic cluster, or that lying out- 
side the bundie ring, is so irregular in its division that no definite 
limits can be fixed. It iseasier to distinguish the new walls here 
than in the tissues of the bundles. They appear to arise with no 
order. It can only be said that the cells of the zone lying next 
the meristem of the central cylinder are capable of growth and 
division, and that they form new cells rapidly enough to keep 
pace with the growth within. 
Anatomy of the Mature Gynophore. 
Two distinct parts may be recognized in the completed gyno- 
phore: that above ground with a smooth even surface, and that 
below, whose surface bears the hairs. The surface of the aerial 
portion is flecked with numerous lenticels which open length- 
