Bell, Charles: The anatomy of the brain: explained in a series of engravings (London, 1802)

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same time with the third; and he quotes on his margin Vieussens
and Winslow. This is by no means accurate; Vieussens says, under
the marginal title, " quid Vulva? Vulva nihil aliud est, quam fora-
" men circa anticam ventriculorum anteriorum cerebri regionem,
" subtus fornicem reconditum, et juxla radices illius excavatum;
" cujus interventu predicti anteriores ventriculi cum tertio commu-
" nicant" The Anus and the Vulva it must be recollected are very
distinct parts, and it does not take away from the accuracy of this de-
scription, that Vieussens conceived the Anus likewise to form a com-
munication betwixt the Ventricles. It is only the latter of those pas-
sages which Dr. Monro has taken notice of, though the quotation T
have given immediately precedes.

Winslow and Vieussens are by Dr. Monro classed together in the
same note, although Winslow distinctly says, " The Infundibulum
" opens above immediately before the Optic Thalami, by the oval
" hole named Foramen Commune Anterius, and consequently com-
" municates ivith the lateral Ventricles."—In another place, " This
" Canal opens forward into the Infundibulum under the Foramen
" Commune Anterius, by which it likewise communicates with the
" lateral Ventricles.'" This is as decided and as true a description of
the communication as that of Dr. Monro himself: the only difference
is, that Winslow says it is a passage betwixt the third and the two
lateral Ventricles, while Dr. Monro says it is a passage betwixt the
two lateral Ventricles and the third.

Neither has Dr. Monro, in the note of page 11 of his System, con-
veyed the sense of another very celebrated Author. In quoting Hal-
ler he has these words, " Leniter tamen impulso flatu non reperi
" aerem a dextra cavea in sinistram transiisse, aut aquam in alterius
" lateris ventriculum missam agitasse." We might suppose from
this quotation that Haller had not observed the communication.