. Animal and vegetable physiology, considered with reference to natural theology. Biology; Physiology; Plant physiology; Natural theology. One inconvenience attending the limiting of the illumina- tion of each point of the wall to that of a single ray, in the mode last pointed out, is that the image produced must ne- cessarily be very faint. If, with a view of remedying this defect, the aperture were enlarged, the image would, indeed, become brighter, but would at the same time be rendered more indistinct, from the intermixture and mutual interfe- rence of adjacent rays; for all the lines woul
. Animal and vegetable physiology, considered with reference to natural theology. Biology; Physiology; Plant physiology; Natural theology. One inconvenience attending the limiting of the illumina- tion of each point of the wall to that of a single ray, in the mode last pointed out, is that the image produced must ne- cessarily be very faint. If, with a view of remedying this defect, the aperture were enlarged, the image would, indeed, become brighter, but would at the same time be rendered more indistinct, from the intermixture and mutual interfe- rence of adjacent rays; for all the lines would be spread out, the outlines shaded off, and the whole picture confused. The only mode by which distinctness of image can be ob- tained with increased ilhimination, is to collect into one poin^ a great number of rays proceeding from the corre- sponding point of the object to be represented. Such a col- lection of rays proceeding from any point, is termed, in the language of optics, a pencil of rays; and the point into. 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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Keywords: ., bookcentury18, booksubjectnaturaltheology, booksubjectphysiology
