Biology

Cover Biology
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diffuse themselves into the substance of the anatomical elements ; living molecules of new formation intercalate themselves by intussusception with the molecules primitively existing; the cellular membrane extends ; the protoplasm grows ; then the form of the histological elements often modifies itself. It is in this manner, for example, that the ligneous fibres form themselves. The cells, at first spherical, elongate, and become cylindrical ; their extremities adhere to each other, either squa
...rely or obliquely. Concentric layers deposit themselves successively on the inner surface of the partition, which they thicken. 1 In other tissues the spherical or polyhedrical cell grows simply by increasing in age without losing its first form. Sometimes, even, we can determine the relative ages of the cells of a tissue by the variations in volume. In the pith of many plants the cells go on regularly and gradually decreasing in volume from the central region, where they are the most aged, to the circum- ference, where they are youngest.

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