EUCALYPTUS TREES. 11 
forms dark isolated lines or pores. The individual tubes forming 
them are more crowded towards the periphery of the annual rings, 
the rest scattered or isolated; their walls are copiously dotted 
and their cavities partly filled with cellular substance. Short 
(parenchyma) cells are sparingly developed in the woody mass. 
The copious woody fibres are elongated, pointed towards one ex- 
tremity, thickened towards the other. The medullary rays are 
exceedingly fine and in close proximity; they consist of one to 
three rows of short cells. The darker concentric lines, indicating 
the rings of annual growth, are easily perceptible. 
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Fie. I1I.—Transverse section of aged wood of Eucalyptus globulus, magnified 
300 times diametrically. The large openings represent the vascular tubes; the 
rows of elongated cells constitute the medullary rays; the scattered cells and 
those near the vascular openings are parenchyma; the woody fibres are numerous, 
closely set, and in diameter smaller than the parenchyma-cells, 
