428 Dr. Philip’s additional experiments on the 
opium instead of spirit of wine ; the result was in all respects 
the same, except that the action of the heart was less in- 
creased than by the spirit of wine. 
Under the term brain, I mean to include the cerebellum as 
well as cerebrum. From many trials on rabbits made to 
ascertain the point, I could not perceive that the heart is more 
or less affected either by chemical or mechanical stimuli ap- 
plied to the cerebellum than to the cerebrum ; nor are the 
muscles of voluntary motion affected by wounding the cere- 
bellum, except we approach the source of the spinal marrow 
and nerves. In some of my experiments, I thought that 
stimuli applied to the cerebellum affected the action of the 
heart rather more powerfully than when applied to the cere- 
brum ; but this was contradicted by other experiments. 
Exp. 4. I repeatedly cut off the head of a rabbit close to 
the occiput. For some time the trunk and limbs were affected 
with violent spasms. The cut end of the spinal marrow was 
so sensible that the slightest touch of a wire, after the spasms 
had subsided, immediately excited the action of the muscles 
of voluntary motion. The strongest spirit of wine and 
watery infusion of opium were applied to it, without producing 
the least effect on those muscles. The application, however, 
of stronger chemical stimuli, the nitric and muriatic acids, 
throw them fnto powerful contractions. 
Having deprived a rabbit of sensation and voluntary motion, 
in an experiment already laid before the Society, I found that 
both spirit of wine and a watery infusion of opium applied to 
the spinal marrow, increase the action of the heart. 
Exp. 5 . 1 found both in rabbits and frogs that, after all stimuli 
applied either to the brain or spinal marrow had ceased to 
