 | 1829 - 522 pages
...the eye, is that in virtue of which it sees what are called ocular spectra, or accidental colours. If we place a red wafer on a sheet of white paper, and, closing one eye, keep the other directed for some time to the centre of the wafer, then if we turn... | |
 | Francis Lieber, Edward Wigglesworth, Thomas Gamaliel Bradford - 1832 - 650 pages
...most curious affections of the eye is that which gives rise to ocular spectra, or accidental colors. If we place a red wafer on a sheet of white paper, and, closing one eye, keep the other directed, for some time, to the centre of the wafer, then, if we turn... | |
 | Encyclopaedia Americana - 1832 - 620 pages
...most curious affections of the eye is that which gives rise to ocular spectra, or accidental colors. If we place a red wafer on a sheet of white paper, and, closing ом eye, keep the other directed, for sonn time, to the centre of the wafer, then, if we turn... | |
 | Francis Lieber, Edward Wigglesworth - 1835 - 620 pages
...most curious affections of the eye is that which gives rise to ocular spectra, or accidental colors. If we place a red wafer on a sheet of white paper, and, closing one eye, keep the other directed, for some time, to the centre of the wafer, then, if we turn... | |
 | 1838 - 214 pages
...the eye is that, in virtue of which it sees what are called ocular spectra, or accidental colours. If we place a red wafer on a sheet of white paper, and, closing one eye, keep the other directed for some time to the centre of the wafer, then, if we turn... | |
 | Thomas Johnstone Aitkin - 1838 - 632 pages
...colour impressed, but of a different colour, varying according to that which had been impressed. Thus, if we place a red wafer on a sheet of white paper, and keep one eye for some time steadily fixed on a mark in its centre, after some time, if the wafer be... | |
 | Popular encyclopedia - 1846 - 1018 pages
...most curious affections of the eye is that which gives rise to ocular spectra, or accidental colours. If we place a red wafer on a sheet of white paper, and, closing one eye, keep the other directed for some time to the centre of the wafer, then, if we turn... | |
 | William Clarke - 1855 - 722 pages
...affections of the eye is that i of which it sees what are called ocular spectra, or accidental colours. If we place a red wafer on a sheet of white paper, and, closing one eye, keep the other directed for some time to the centre of the wafer, then, if we turn... | |
 | John Gardner Wilkinson - 1858 - 482 pages
...following are among the observations made by Sir David Brewster on the subject of accidental colours. If we place a red wafer on a sheet of white paper, and fix the eye on the red spot, and then turn the eye to the white paper, we shall see on it an image of that spot... | |
 | Ireland commissioners of nat. educ - 1861 - 310 pages
...constituted of yellow and blue. The eye may be rendered insensible to any colour, by looking steadily at it. If we place a red wafer on a sheet of white paper, and look at it for some time, the paper -will appear covered with green spots of the same size as the wafer.... | |
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One of the most curious affections of the eye is that, in virtue of which it sees what are called ocular spectra, or accidental colours. If we place a red wafer on a sheet of white paper, and, closing one eye, keep the other directed for some time to... 
