The Flowering of the Forest Trees 83 
one. ‘‘ Yet the vestiges of the seeds which have 
not matured,” says Prof. Gray, ‘‘and of the want- 
ing cells of the pod, may always be detected in 
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Very young horse-chestnut bur cut crosswise (a) and lengthwise (4), showing that 
it is at this stage a three-chambered pod enclosing six seeds. 
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Very young acorn cut crosswise (c), showing its three chambers and six ovules. 
Older acorn cut crosswise (¢), showing that two of the original six ovules have 
vanished and that a third is dwindling. 
Fig. 14.—Young horse-chestnut bur and young acorns. 
the ripe pod.” The very young acorn is divided 
into three compartments, and each compartment 
has two ovules hanging from its summit. One 
might, therefore, expect the mature acorn to be a 
