through the fangs into the eyes of the onlookers. There was no danger
in this case, and the doctor inserted a shallow glass saucer into the
mouth of the snake behind the fangs, permitted it to eject its poison,
and then himself squeezed out the remaining poison from the poison-
bags through the fangs. From the big lachecis came a large quantity of
yellow venom, a liquid which speedily crystallized into a number of
minute crystals. The rattlesnake yielded a much less quantity of white
venom, which the doctor assured us was far more active than the yellow
lachecis venom. Then each snake was returned to its box unharmed.

After this the doctor took out of a box and presented to me a fine,
handsome, nearly black snake, an individual of the species called the
mussurama. This is in my eyes perhaps the most interesting serpent in
the world. It is a big snake, four or five feet long, sometimes even
longer, nearly black, lighter below, with a friendly, placid temper.
It lives exclusively on other snakes, and is completely immune to the
poison of the lachecis and rattlesnake groups, which contain all the
really dangerous snakes of America. Doctor Brazil told me that he had
conducted many experiments with this interesting snake. It is not very
common, and prefers wet places in which to live. It lays eggs, and the
female remains coiled above the eggs, the object being apparently not
to warm them, but to prevent too great evaporation. It will not eat
when moulting, nor in cold weather. Otherwise it will eat a small
snake every five or six days, or a big one every fortnight.

There is the widest difference, both among poisonous and non-poisonous
snakes, not alone in nervousness and irascibility but also in ability
to accustom themselves to out-of-the-way surroundings. Many species of
non-poisonous snakes which are entirely harmless, to man or to any
other animal except their small prey, are nevertheless very vicious