Abstract
The author has divided the observations contained in this paper into two parts:—the first of which treats of “The Development of the Retina and Optic Nerve; the second, of the Development of the Membranous Labyrinth and Auditory Nerve.” In the observations on the development of the retina, which have been made on the embryo of the chick, the author demonstrates its mode of evolution, and also the mode of development of the various layers of which this membrane is formed. They commence at the early period of the thirty-third hour of incubation, at which time the cephalic extremity of the embryo presents a slight protrusion of its walls, which by the thirty-sixth hour is very considerably increased, having become more elongated and protruded outwards, presenting a somewhat dilated end, and being somewhat constricted at its connection with the anterior cerebral cell from which it arises. This is the first indication of the development of this membrane.
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