Read it through once

It is a handsome tree, but a very dangerous one, for the slightest cut on the surface produces a flow of a very fine white milk which is acrid and poisonous. This juice produces temporary or total blindness if the slightest speck enters the eyes, or even if one sits over a fire made of its wood. It is probably not true that people are killed if they merely sleep below it, and grass will probably grow quite well under its shade, although there are stories which deny this. Blowpipes and poisoned darts are used by many savages in Asia and South America. Perhaps the Curare or Woorali poison is the most wonderful of the South American kinds. The tree, _Strychnos sp._, grows along the Amazon and in the Guianas. The poison is obtained from the wood and bark, and several other vegetable substances are mixed with it. (This is a very common feature of native drugs and increases the chances of doing _something_.) It is a blood poison, and a very deadly one. Large animals like the tapir stagger about, collapse, and die after a very few steps, if they have been wounded by a dart. Humboldt declares that the earth-eating Otomaks were able to kill their antagonists by the mere pressure of their poisoned thumbnails.