OD-PRESSURE
17 millimetres.
3.3 p.m. Sciatic nerve stimulated. RISE OF 14 MILLIMETRES.
4.44 p.m. Sciatic nerve stimulated. RISE OF 2 MILLIMETRES."

The little animal is growing weaker. For more than six hours it has
been on the rack. The play upon its nervous system is about over. At
five o'clock the dog died.

The full details of this experiment do not here concern us, and are
not given. Whether useful or not is another matter Pain, said
Professor Langley, "WOULD CAUSE A RISE OF BLOOD-PRESSURE." Did not the
blood-pressure rise when this creature's nerve was stimulated?

EXPERIMENT 114. In this experiment four dogs were simultaneously
vivisected. Some of them lasted but a short time; but one--a young
dog--was "in splendid condition," and subserved the object of the
vivisection for many hours. The usual incisions were made in the
trachea and carotid artery, and the femoral vein and sciatic nerve was
exposed. At 10.59 a.m. the blood-pressure was found to be 125 milli-
metres; at 10.42 it had been reduced to 99 millimetres--by what means
we are not informed. Further details are as follows:

"11.42 a.m. Blood pressure 99 millimetres.
11.45 a.m. Stimulated sciatic nerve. PRESSURE ROSE TO 115
MILLIMETRES.
12 midday. Blood-pressure 95. Sciatic nerve stimulated:
BLOOD-PRESSURE 115.
12.19 p.m. Blood-pressure 92.
1.23 p.m. Blood-pressure 108; sciatic nerve stimulated.
1.26 p.m. Blood-pressure 110; three minutes later."

Between 1.29 p.m. and 2.19 p.m. there is no record of any
observations. Perhaps we may venture the hypothesis that during this
period of nearly an hour's duration, the young experimenters went out
to luncheon. The dog, while stretched upon the rack, could have had
no other refreshment than cessation from the stimulation of its
nerves.

But after about an hour's intermission the young vivisectors would
seem again to have begun their observations concerning the effect
produced by stimulating the sciatic nerve. What was that effect? It
appears to have been very uniform.

"2.28 p.m. Sciatic nerve stimulated. ABRUPT RISE AND FALL IN
BLOOD-PRESSURE.
3.32 p.m. Sciatic nerve stimulated. RISE AND FALL IN
BLOOD-PRESSURE.
4.16 p.m. Sciatic nerve stimulated. BLOOD-PRESSURE ROSE TO 120,
FALLING TO 105.
4.34 p.m. Sciatic nerve stimulated. ABRUPT RISE AND FALL OF
BLOOD-PRESSU