268 MR. NEWPORT ON THE NERVOUS AND CIRCULATORY SYSTEMS 
peared to commence on the opposite side, in the leg's corresponding to those which 
were first irritated. In eighteen hours the anterior part of the body was quite dead, 
no motions whatever could be excited on it, either voluntary or reflex ; but reflex 
actions were then readily excited in the posterior, and also slightly so by mechanical 
irritation, even at twenty-four hours. 
Other experiments were now made on the brain itself without detaching the head 
of the animal from the body. 
Experiment 6. — The brain was completely divided longitudinally in the centre by 
a fine pair of scissors. All power of recognising objects was immediately lost. The 
antennae were perfectly motionless, and the animal at first moved directly forwards, 
as in the first and second experiments, dragging the antennae along with it at the sides 
of the head. It passed on with the head and first segment elevated, and climbed 
over every slight obstacle, and when opposed did not turn to the right or to the left, 
but passed forwards with the legs moving rapidly as in the act of running. At the 
expiration of half an hour it had regained a little power in the left antenna, and then 
constantly moved in a circle to the left side. When either antenna was pinched a 
sudden convulsive movement was induced in the whole body, but the antennae were 
not retracted when touched, as they always are by the uninjured animal. At the ex- 
piration of an hour, slight motion was regained in both antennae, but the movements 
to the left side were still continued. The brain was now entirely destroyed with a 
needle. All power of volition, which seemed to have been partly restored, as well as 
the use of the antennae, were instantly lost, and the movements of the legs and body 
were precisely similar to those already seen in the decapitated specimens. Pinching 
the antennae did not occasion the slightest convulsion of the body, or reflected 
movements of the legs, but slight pressure on the segments immediately induced 
them, and also violent contortions of the whole body, especially when applied to the 
anterior segments. In this specimen the reflected movements were excited at the 
expiration of eighteen hours, but mostly so, at that time, at the posterior extremity 
of the body. 
Experiment 7- — The brain was divided in the middle, and one lateral half with the 
antennal ganglion and optic nerve were removed. Some of the motions of the an- 
tenna of the uninjured side seemed to indicate the remains of volition. The animal 
coiled itself up and remained quiet as in health, but the posterior legs of the body were 
in constant motion. The power of recognizing objects appeared almost entirely de- 
stroyed. When the remaining lobe of the brain was irritated with the point of a 
needle, the body was again extended and excited to slow progression forwards, exactly 
as in the preceding experiments, but the power of moving was very feeble. At the 
expiration of two hours, the specimen having remained undisturbed in the interval, 
slow progressive movements in a circle were induced by pressure on the segments, 
and always in the direction of the injured side, the left in this specimen. 
Experiment 8. — The lobe on the right side of the brain was removed, and the 
