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The Nineteenth Century , No 182, Apr 1892 [‎81r] (166/244)

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The record is made up of 1 volume (120 folios). It was created in Apr 1892. It was written in English. The original is part of the British Library: India Office The department of the British Government to which the Government of India reported between 1858 and 1947. The successor to the Court of Directors. Records and Private Papers Documents collected in a private capacity. .

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1892
COL 0UR-BLINDNESS
651
occurrence of absolute colour-blindness). On the other hand, the
form of colour-blindness which is so commonly met with is in every
case a green-red colour-blindness. 2
It is thus evident that the facts are in substantial harmony with
the requirements of the theory, and we can also see that we may, for
all practical purposes, confine ourselves to the consideration of the
particular variety of partial colour-blindness which we shall call red-
green colour-blindness.
This colour-blindness would, in Hering's view, not be a condition
in which the eye is insensitive to either green or red, but rather a
condition in which the eye is blind to that distinction between red
and green rays which comes as a matter of course to the normal eye.
This - view of the nature of colour-blindness is based upon observa
tions which were made by Hering in connection with the optical phe
nomenon known either simply as ' colour-shadows,' or more commonly
as ' Hering's colour-shadows,' in consequence of the important im
provements in the methods of demonstrating them which were
introduced by that physiologist. The phenomenon itself has, how
ever, been long known, and Goethe, for instance, experimented upon
the subject with a lead-pencil, and the shadows which were cast from
it by his candle and the full moon at his window.
The principle involved in the production of colour-shadows is,
that if we have two sources of light placed so that the rays emanating
from them shall be incident in the same plane upon any opaque
object which is placed to intercept their rays, two contiguous shadows
will be cast on a background of, let us say, a sheet of white paper.
If, now, the light from the one source is a coloured light (we may
assume for the sake of fixing our ideas that it is a blue light we are
dealing with), while the light from the other source is a white
light of somewhat comparable— i .e. of duly diminished—intensity, the
portion of the paper which is screened off from the white light will,
under these circumstances, naturally come out of a relatively saturated
blue. So much might have been expected On the other
hand, it is at first somewhat startling to find that the companion
shadow from which the blue light is screened off by the intercepting
body comes out a yellow which is quite comparable in intensity to
the brilliancy of the blue shadow. In the same way, a red light
would have induced the contrast green on the companion shadow,
and, vice versa, a yellow would have induced a blue, and a green a
2 The faculty of distinguishing between red and green is for many reasons
nssnmed to be less primitive than the faculty of distinguishing between blue and
yellow. This view is based on the fact that the power of making the distinction
between red and green is limited to the central area of the retina, while yellow can
be distinguished from blue in any part of the field. Further, it is based on the fact
that the faculty is not unfrequently congenitally absent. Lastly, it is based on the
fact that it may be lost either by accidental injury to the eyes, or, as we have seen,
by the abuse of drugs.

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Content

The file contains a copy of the journal The Nineteenth Century. A pencil note on the cover of the journal, in the hand of Lady Pelly, indicates that Lewis Pelly was being read an article from this journal on Easter Sunday five days before he died.

The article he and his wife were reading has been marked on the cover 'Prospects of Marriage for Women, by Miss Clara E Collet' which appears on folios 24-31.

A second annotation, written by Sir William Henry Rhodes Green, gives the date of Lewis Pelly's death and is provided as context to Lady Pelly's comments.

Extent and format
1 volume (120 folios)
Physical characteristics

The journal contains one set of foliation and three sets of original pagination.

The principal foliation for this volume appears in the top right hand corner of the recto The front of a sheet of paper or leaf, often abbreviated to 'r'. of each folio, using a pencil number enclosed with a circle.

The three sets of original printed pagination that appear are as follows:

The advertisments at the front of the journal are paginated as i-xxxii; the articles themselves are paginated as 525-712; and the Sampson Low, Marston & Company publications list at the rear of the journal has been paginated as 1-8.

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English in Latin script
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The Nineteenth Century , No 182, Apr 1892 [‎81r] (166/244), British Library: India Office Records and Private Papers, Mss Eur F126/28, in Qatar Digital Library <https://www.qdl.qa/archive/81055/vdc_100023318122.0x0000a7> [accessed 28 March 2024]

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