[Missionary Travels and Researches in South Africa by David Livingstone]@TWC D-Link book
Missionary Travels and Researches in South Africa

CHAPTER 21
18/42

Next morning the distillation, so far from being affected by the attempt to stop the supplies, supposing they had come up through the branch from the tree, was increased to a drop every 5 seconds, or 12 drops per minute, making 1 pint (16 ounces) in every 24 hours.

I then cut the branch so much that, during the day, it broke; but they still went on at the rate of a drop every 5 seconds, while another colony on a branch of the same tree gave a drop every 17 seconds only, or at the rate of about 10 ounces 4-4/5 drams in 24 hours.

I finally cut off the branch; but this was too much for their patience, for they immediately decamped, as insects will do from either a dead branch or a dead animal, which Indian hunters soon know, when they sit down on a recently-killed bear.

The presence of greater moisture in the air increased the power of these distillers: the period of greatest activity was in the morning, when the air and every thing else was charged with dew.
Having but one day left for experiment, I found again that another colony on a branch denuded in the same way yielded a drop every 2 seconds, or 4 pints 10 ounces in 24 hours, while a colony on a branch untouched yielded a drop every 11 seconds, or 16 ounces 2-19/20 drams in 24 hours.

I regretted somewhat the want of time to institute another experiment, namely, to cut a branch and place it in water, so as to keep it in life, and then observe if there was any diminution of the quantity of water in the vessel.


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