The newest, leaf of an old tree is not really new at all. It is as old in its way as the tree itself. Professor H. M. Benedict lias, following the belief oj nurserymen, finally proved it beyond, dispute, and he can tell the grower of fruit trees whether a branch is a cutting or a seedling, whether it is really young or old. No more will tho fruitgrower purchase cuttings when he desires seedlings if he is the possessor of a magnifying class. Tho secret of the difference is disclosed by the venation of the leaf, which becomes closer as tho plant grows older. ; -Practical fruitgrowers have," says Dr Benedict, " for some time insisted that- cuttings do show relation to the ago of the parent tree. They observed this in the bearing qualities of the tree. But botany has alwavß said this was impossible. Now we 'are able to prove that the practical nurserymen are in tho right!. The principle involved is that of senility, or the gradual loss of power, even when all external things are favorable. Senility applies to youth as well as age in this connection; in fact-, it- is most marked in the earliest stages of some animal forms, especially human beings. In plant life- the embryonio tissue, whereby the plant grows t partakes of the ago of the plant itself. This is the point which contradicts formerly accepted botanical principles. In other words, the new twig, which presents itself on the older branch in springtime, is not a new growth, as has been thought; it is as old as tho tree from which it springs. As tho plant grows older the multiple cells which carry the nourishment in the leaf become smaller in size and greater in number. It was by noting marked, differences here and establishing a more or less uniform scale that the botanist was able to establish this new principle." ssssgss======
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BOTANIST'S DISCOVERY, Evening Star, Issue 15642, 5 November 1914
BOTANIST'S DISCOVERY Evening Star, Issue 15642, 5 November 1914
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