This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1908 Excerpt: ...saw covering the field of vision patterns of perfect symmetry and geometrical regularity, sometimes lozengeshaped, but often passing into more complex forms of equal symmetry. He discusses how these geometrical spectra can originate, for they do not appear to be retinal impressions, or mental reminiscences; they do not ...
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1908 Excerpt: ...saw covering the field of vision patterns of perfect symmetry and geometrical regularity, sometimes lozengeshaped, but often passing into more complex forms of equal symmetry. He discusses how these geometrical spectra can originate, for they do not appear to be retinal impressions, or mental reminiscences; they do not arise from any conscious effort of the mind; they recurred, in different shapes, just before lapsing into unconsciousness on two occasions when he was under chloroform; and he suggests that they afford some evidence " of a thought, an intelligence working within our own organization distinct from that of our own personality,"1 or, as psychologists would now say, they afford some evidence of a " sub-conscious self." 1 "Familiar Lectures on Scientific Subjects," by Sir J. F. "W. Herschel, Bart., X.H., D.C.L., F.K.8., &C., p. 412. Note By J. Ledwidge, A.r.c.sc. As suggested by Professor Barrett, I add a brief statement of the appearances presented to me by the phenomena which the Professor has described. 1. Haidinget's tlifts.--The yellow sectors appear to me also very like an hour-glass in shape; the blue or violet areas at right angles to the yellow I see clearly; they much resemble the shape of the moon in her third quarter (see fig. 1, Plate VI.), and sometimes seem to unite across the narrow part of the hour-glass-shaped area. In general the tufts vanish with me in rather less than three seconds, so that the Nicol must be kept moving to see them continuously. When a blue glass or a blue solution of the oxalate of chromium and potassium is held before the Niool, the tufts occupy a slightly smaller area than the claret-coloured area due to the macula lutea or yellow spot, as I have noticed a fringe of th...
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