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Then we studied geotropism by observing how our plant grew toward the ceiling, even after we tipped the plant on its side for a few days.

The relations between vegetable and animal geotropism have been more recently investigated by J. Loeb.

After the tips had been regenerated, geotropism was able to act on them, so that they now became bowed vertically downwards.

Thus I am now observing something about geotropism, and I had no idea a few weeks ago that this would have been necessary.

It must also be granted that geotropism has a bearing on the problem, since all plants twine upwards, and cannot twine along a horizontal support.