Publisher's Synopsis
Excerpt from The Physiology Diseases of Hevea Brasiliensis, the Premier Plantation Rubber Tree
Medullary lines radiating through the wood. These lines Rays. Are, as a rule, not continuous from the centre to the circumference. Those which start from the centre end after a short distance, while others starting at various depths reach the circumference. These are the medullary mys. They are thin vertical plates of more or less cubical cells, wedged in between the longitudinal fibres and vessels. In the vertical direction, they extend only for a short distance; they are not continuous from the top to the bottom of the stem. When the stem is cut longitudinally they form what is known as the 'silver grain These medullary rays play an important part in the transport of food in the stem, as will be explained subsequently.
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