mach sways the
world; the data supplied by food are the chief of all the documents of
life. Well, in spite of his innocent appearance, the Lampyris is an
eater of flesh, a hunter of game; and he follows his calling with rare
villainy. His regular prey is the Snail.

This detail has long been known to entomologists. What is not so well
known, what is not known at all yet, to judge by what I have read, is
the curious method of attack, of which I have seen no other instance
anywhere.

Before he begins to feast, the Glow-worm administers an anaesthetic: he
chloroforms his victim, rivalling in the process the wonders of our
modern surgery, which renders the patient insensible before operating
on him. The usual game is a small Snail hardly the size of a cherry,
such as, for instance, Helix variabilis, Drap., who, in the hot
weather, collects in clusters on the stiff stubble and other long, dry
stalks by the road-side and there remains motionless, in profound
meditation, throughout the scorching summer days. It is in some such
resting-place as this that I have often been privileged to light upon
the Lampyris banqueting on the prey which he had just paralysed on its
shaky support by his surgical artifices.

But he is familiar with other preserves. He frequents the edges of the
irrigating ditches, with their cool soil, their varied vegetation, a
favourite haunt of the Mollusc. Here, he treats the game on the ground;
and, under these conditions, it is easy for me to rear him at home and
to follow the operator's performance down to the smallest detail.

I will try to make the reader a witness of the strange sight. I place a
little grass in a wide glass jar. In this I instal a few Glow-worms and
a provision of snails of a suitable size, neither too large nor too
small, chiefly Helix variabilis. We must be patient and wait. Above
all, we must keep an assiduous watch, for the desired events come
unexpectedly and do not last long.

Here we are at last. The Glow-worm for a moment investigates the prey,
which, according to its habit, is wholly withdrawn in the shell, except
the edge of the mantle, which projects slightly. Then the hunter's
weapon is drawn, a very simple weapon, but one that cannot be plainly
perceived without the aid of a lens. It consists of two mandibles bent
back powerfully into a hook, very sharp and as thin as a hair. The
microscope reveals the presence of a slender groove running throughout
the length. And t