. Animal and vegetable physiology considered with reference to natural theology. Natural theology; Physiology; Plant physiology; Biology. VISION, 43:5 row, or form a triangle. Their structure has been minutely examined by Professor ^Muller, who found them to contain a hard and spherical crystalline lens, a vitreous humour, and a choroid coat, with its accompanying black pigment; the whole being covered externally by a convex cornea. The stem- mata of a caterpillar, which has eight of these eyes, are shown in Fig. , connected together by. a circular choroid membrane (x x) common to the whol
. Animal and vegetable physiology considered with reference to natural theology. Natural theology; Physiology; Plant physiology; Biology. VISION, 43:5 row, or form a triangle. Their structure has been minutely examined by Professor ^Muller, who found them to contain a hard and spherical crystalline lens, a vitreous humour, and a choroid coat, with its accompanying black pigment; the whole being covered externally by a convex cornea. The stem- mata of a caterpillar, which has eight of these eyes, are shown in Fig. , connected together by. a circular choroid membrane (x x) common to the whole; together with the separate branches (o o) of the optic nerve (n), belonging to each. All the Arachnida possess eyes of this latter description ; and from their greater size afford faci- lities for dissection, which are not met with among proper insects. Their number in Spiders is gene- rally eight; and they are disposed with great sym- metry on the upper side of the head. Fig. 420 represents, on a magnified scale, one of the large stemmata, on the head of the Scorpio tunensis, dis- sected so as to display its internal parts; in which are seen the cornea (c), derived from an extension of the integument (i); the dense spherical crystal- line lens (l) ; the choroid coat with its pigment (x),* forming a wide opening, or pupil; the vitreous * Marcel de Serres states, that some of the stemmata of the in- sects which he examined contain a tliin choroid, having a silvery lustre, as if intended as a reflector of the light which falls on it. VOL. II. F F. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Roget, Peter Mark, 1779-1869. London : W. Pickering
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