Strychnos (Strychnos Toxifera) contains within its bark 
curare used by the Indians of the northern part of South 
America as an arrow poison. The plant was brought back 
to England by Sir Walter Raleight in 1595 from Guiana on 
his return from one of his buccaneering voyages and was 
described in his book Discovery of the Large, Rich and 
Beautiful Empire of Guiana. A larger quantity curare was 
later found to be obtainable from another plant 
Chondodendron tomentosum. Curare produces a paralysant 
effect only on injection; they are harmless when taken by 
mouth so that a wound inflicted by a poisoned arrow can 
safely be sucked in the absence of any oral lesion. When 
injected intravenously, curare causes ptosis and paralysis 
of the recti. It was recommended for cataract surgery to 
maintain immobility of the globe.