Disease is rampant, especially on the smaller branches of the rivers. The incurable beri-beri and a large assortment of fevers claim first place as death dealers, smiting the traveller with fearful facility. Next come a myriad of insects and reptiles—alligators, huge bird-eating spiders, and snakes of many varieties. Snakes, both the poisonous and non-poisonous kinds, find here conditions precisely to their liking. The bush-master is met with in the more open places, and there are many that are venomous, but the most terrifying, though not a biting reptile is the water-boa, the sucurujú (Eunectes murinus) or anaconda. It lives to a great age and reaches a size almost beyond belief. Feeding, as generally it does at night, it escapes common observation, and white men, heretofore, have not seen the largest specimens reported, though more than thirty feet is an accepted length, and Bates, the English naturalist, mentions one he heard of, forty-two feet long. It is not surprising that Mr. Lange should have met with one in the far wilderness he visited, of even greater proportions, a hideous monster, ranking in its huge bulk with the giant beasts of antediluvian times. The sucurujú is said to be able to swallow whole animals as large as a goat or a donkey, or even larger, and the naturalist referred to tells of a ten-year-old boy, son of his neighbour, who, left to mind a canoe while his father went into the forest, was, in broad day, playing in the shade of the trees, stealthily enwrapped by one of the monsters. His cries brought his father to the rescue just in time.