. Animal and vegetable physiology, considered with reference to natural theology. Biology; Physiology; Plant physiology; Natural theology. 324 THE SENSORIAL FUNCTIONS. a double convex lens; anil it has the property of collecting into a focus rays proccedinj; from distant ;^ 410. Ilavinii: obtained this instniincMil, wc mav now venture to enlarge the a])ertui'e tlii-oni;h wlilch the light was admit- ted into our dark chamber, and fit into the apertivrc a dou- ble convex lens. Vv'e hnve thus constructed the well known optical instrument called the Camera Ohscura, in which the imaj];e
. Animal and vegetable physiology, considered with reference to natural theology. Biology; Physiology; Plant physiology; Natural theology. 324 THE SENSORIAL FUNCTIONS. a double convex lens; anil it has the property of collecting into a focus rays proccedinj; from distant ;^ 410. Ilavinii: obtained this instniincMil, wc mav now venture to enlarge the a])ertui'e tlii-oni;h wlilch the light was admit- ted into our dark chamber, and fit into the apertivrc a dou- ble convex lens. Vv'e hnve thus constructed the well known optical instrument called the Camera Ohscura, in which the imaj];es of external objects are formed upon a white sur- face of paper, or a 5cnii-transj)arent ])latc of glass; and these images must evidently bo in an inverted position with re- •pect to the actual objects which they represent. Such is precisely the construction of the eye, which is, to • The refraction by spherical surfiiccs docs not, strictly speakint^, unite x pencil of pnrallel or divergent rays into a muthematicul point, or focus; for in reality the rays wiiich are near the central line are made to converg-e to a point a little more distant than that to which tiie remoter rays converg-e: an •ffect which 1 have endeavoured to ilUistrate by the diagram Fig-. 411} where,. 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. Philadelphia, Carey, Lea & Blanchard
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