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Those trees called exogenous grow by means of successive layers on the outside. The inside may be dead, or even removed altogether, without affecting the life of the tree. This is the case with most of the trees of our climate. The other class is called endogenous, and increases by layers applied to the inside; and when the hollow there is full, the growth is stopped the tree must die.
During the precious hours that should have been devoted to the mastering of the sub-divisions of the celenterata or the natural orders of endogenous plants, he was expending his energies in endeavouring to recall the words of the song which his cousin had sung the evening before, or to recollect the exact intonation with which she remarked to him that it had been a fine day, or some other equally momentous observation.
The word endogenous, inside-growing, is not, therefore, a correct one to describe the growth of most monocotyledons, for the growth takes place where the leaves originate, near the exterior of the stem. Gray's First Lessons. Sect. VI. Sect, XVI, §1, 401-13. §3. §6, 465-74. How Plants Grow. Chap. 1, 82, 90-118.
Any injury is felt most severely by the first class on the bark; by the second on the inside; while the inside of the exogenous may be removed, and the outside of the endogenous may be cut, without stopping the growth in the least. The mowana possesses the powers of both.
I may here notice the often repeated but mistaken assertion, that the petrified wood of the Western Arabian desert consists wholly of the stems of palms, or at least of endogenous vegetables. This is an error.
Spores are special rounded or oval bits of bacteria protoplasm capable of resisting adverse conditions which would destroy the ordinary bacteria. They arise among bacteria in two different methods. Endogenous spores. They first appear as slight granular masses, or as dark points which become gradually distinct from the rest of the rod.
The stronger the nature, the more it is reactive. Let us have the quality pure. A little genius let us leave alone. A main difference betwixt men is, whether they attend their own affair or not. Man is that noble endogenous plant which grows, like the palm, from within, outward. His own affair, though impossible to others, he can open with celerity and in sport.
Cigarette smoking produces a flabby and endogenous condition of the optic nerve, and constant listening at a telephone, always with the same ear, decreases the power of the other ear till it finally just stands around drawing its salary, but actually refusing to hear anything.
I've lost all that country road, and now I'm on the fringe of London. And I might have loitered all the morning! Ugh! Thank Heaven, sir, you have not the irritable temperament, that you are not goaded to madness by your endogenous sneers, by the eternal wrangling of an uncomfortable soul and body. I tell you, I lead a cat and dog life But what IS the use of talking? It's all of a piece!"
The endogenous monster, indigenous to the Elysian Fields, is to the surrounding vegetation what the cockatrice is to the cock, the wyvern to the python. I should say 'was, for all the replants at Madeira and the Canaries are modern, and resemble only big toothsticks. But 'dragons' proper have existed, and perhaps memories of these portents long lingered in the brain of protohistoric man.
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