142 Mr. Carlisle’s Account of 
accessorius to the par vagum, comes up from the medulla spi- 
nalis, and takes its departure with its usual companion. Not a 
vestige of any other nerve appears in the cranium ; the ca- 
vity being perfectly filled, and all the parts free from diseased 
appearance. See Fig. 4. The vena magna Galeni, or a vein 
analogous to it, passes down the hinder part of the cerebellum, 
into the lateral sinuses, which are the only receptacles for the 
returning blood ; and all the veins of the pia mater open di- 
rectly into these sinuses. Upon cutting through the centre of 
the brain, longitudinally, the intermixture of the cortical and 
medullary substances form the appearance called Arbor vitae, 
in a perfectly natural state ; the texture of those two substances 
being firm and natural. The fourth and only ventricle is unu- 
sually large ; and the portio mollis of the seventh pair of nerves 
arises from its inside, as is usual. The anterior rounded ends 
of the crura cerebri, present a mass of healthy medullary sub- 
stance. The outer surface of the cerebellum is divided into 
the parallel layers or folds, and those vermiform processes, 
which distinguish its general character. 
The narration of these appearances assists and confirms 
other facts, in demonstrating, that the formation and growth 
of animals in the uterus, are independent of any influence 
from those parts of their brain which properly belong to sensa- 
tion. We have to regret, that this animal did not live to 
shew the phenomena of volitions directed to its limbs, and other 
apparatus, without that intelligence from the organs of the 
senses which regulates and directs the efforts of perfect animals. 
The careful observance of such circumstances may, in future, 
bring us to discoveries of the highest value, in that part of phy- 
siology which is now enveloped in deep mystery : the facts at 
