The management and treatment of the horse in the stable, field, and ...

228 The Management and Treatment of the Hon•8C,
mode of development of the beef tapeworm. I will
explain to you one kind of experiment I made. I took
a portion of a tapeworm comprising several of the joints
or segments towards the tail end, each of these joints
when perfectly matured and ripe contain at least 80,000
eggs, therefore you can easily reckon up how many
there would be in 12,000 joints, supposing all were
mature. I took a number of these joints and put them
into milk to make them easy of administration, and with
the assistance of Professor Simons and other friends, fed
a calf with them. Well, they went down, and the calf
was none the worse apparently ; however, after a time it
was evident that something had gone wrong, and what
had taken place was this, some thousands of eggs had
been swallowed, and of these eggs all that were perfectly
ripe contained in their interior each a little creature
called the six-hooded embryo. This small embryo has
a round body provided with two needles in front, and a
pair of hooks on each side ; with the two little needles it
bores, and with a pair of hooks it tears the flesh of the
host. After the calf had swallowed the eggs, the shell of
each egg was dissolved by the gastric juice of the fourth
stomach, all the little embryo thus making their escape ;
this, you see, was kindness to the embryo if it was unfair
to the calf. The thirty thousand of little creatures,
rejoicing in being free, soon made their way through the
flesh of the host. The little calf did not succumb to
these wounds, as the human bearer often does to the
trichime ; by our assistance it recovered. Well, we
calculated how lung it would be before these little em-
bryos would arrive at the higher level stage of develop-