taken off and the
holder placed on the table and the guinea-pig allowed to walk out.

[Illustration: FIG. 176.--Taking guinea-pig's temperature.]

To provide for different-sized animals, two sizes of this holder will be
found useful:

1. Length, 16 cm.; breadth, 6 cm.; size of slot, 8 cm. by 2.5 cm.

2. Length, 20 cm.; breadth, 8 cm.; size of slot, 10 cm. by 2.5 cm.

A convenient holder for mice and even small rats is shown in figure 178,
the tail being securely held by the spring clip. Needless to say, the
holder should be entirely of metal, and the wire cage detachable and
easily renewed.

[Illustration: FIG. 177.--Voge's holder.]

When the animal is anaesthetised, it is more convenient to secure it
firmly to some simple form of operating table, such as Tatin's (Fig.
179), which will accommodate rabbits, guinea-pigs, and rats: or to the
more elaborate table devised by the author (Fig. 180).

[Illustration: FIG. 178.--Mouse holder.]

[Illustration: FIG. 179.--Tatin's operation table.]

~Operation Table.~--This is a table of the "aseptic" type, composed of
steel tubing, nickel-plated or enamelled. The table-top frame is
sufficiently large to accommodate rabbits, dogs and monkeys; and is
supported upon telescopic uprights, so that it is adjustable as to
height; in its long axis it can be inclined (at either end) to 45 deg.
from the horizontal. Further it can be completely rotated about its long
axis. The table-top itself is composed of a sheet of copper wire gauze
loosely suspended from the long sides of the tubular frame. The
slackness of the gauze bed permits of an india rubber hot water bottle,
or an electrotherm being placed under the animal, and if during the
course of an experiment it is necessary to reverse the animal, the
table-top frame is completely rotated, the device adopted for suspending
the gauze is detached and the gauze reversed also, so that it again
supports the animal from below.

[Illustration: FIG. 180.--Author's operating table[12].]

METHODS OF INOCULATION.

The following methods of inoculation apply more particularly to the
rabbit, but from them it will readily be seen what modifications in
technique, if any, are necessary in the case of the other experimental
animals.

~1. Cutaneous Inoculation.~--(_Anaesthetic, none._)

1. Have the animal firmly held by an assistant (or secured to the
operating table).

2. Apply the liquid soap to the fur, over the area selected for
inoc