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Examples of Geotropism
They are, if I may say so, a “mathematical biology”—the survey of a life long study of “tropisms,” which is the name given to express “forced movements” in organisms.
I will quote here only a very few passages, but these books are of such importance that every mathematician and engineer should read them.
In a short time we might earnestly wish for a centrifugal apparatus or a heliostat.
It is impossible for me to predict whether or not we should ever want this or that instrument, for we are guided in our work by what turns up.
The next most remarkable fact, as it appeared to me (page 148), is the discrimination of the tip of the radicle between a slightly harder and softer object affixed on opposite sides of tip.
Read the last chapter, and you will know the whole result, but without the evidence.