E X P L A N A T I O N OF THE TABLES. 109
'icen, with veflels running on its pia mater, but without any hole or
paflage through it.
FIG. III. Reprefents the communication between the lateral ventricles
laid open l?y cutting the fore part of the body of the fornix. By fuch a
feilion, the hole or paflage appears by which the lateral vcntricles communicate
with the thii'd ventricle. •
A The fore part oF the left corpus ftriatum.
C Part of the left thalamus nervi optici.
D The cut body of the fornix between two pins. The undermoft is lying
in the paiTage by which the lateral ventricles communicate with each
other.
F Is a hole or paflage leading down into the third ventricle, by means of
which, therefore, the two lateral ventricles communicate with the thii'd
ventricle.
FIG. IV. Is a rude Iketch, from memoiy, of the fize and ihape of the
communication between the lateral ventricles, which I obferved in the cafe
of a girl of three years old, in the year 1753, where more than two pounds
of water were found in the ventricles.
FIG. V. Is a rude iketch taken from the third and fourth ventricles of a
child of two years of age, in which half a pound of water was contained
in the ventricles. Both thefe ventricles marked 3 and 4 were fenfibly dilated.
A t F, part of the dilated paflage from the lateral ventricle is rudely fketched.
E e TA B L E