E. Nettleship to K. Pearson, 21st Sept. 1911.- External URL
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Sent From (Definite): Edward NettleshipSent To (Definite): Karl PearsonDate: 21 Sep 1911
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Holder (Definite): University College London: Special Collections
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Sent fromEdward Nettleship
21 Sep 1911
Description:
[enclosing draft of contribution to Albinism in Man, including ‘appendix of descriptions’ of dogs (their eyes & skins), wool matches for dog hairs. Discusses poss of including coloured plate for hair, photographs of dogs]
‘Granular & diffuse pigment – I know nothing of any except granular pigment in the eye (of course having the yellow in the yellow-spot of the human retina, which does not count for our own purpose). I have never seen in the eye, either man or dog, anything at all like a uniform sort of amber staining of the albino hairs. The medieval engraving I made of Coats that you refer to was to the same effect. I am virtually certain that both C. & Usher mean granular pigment when they speak of pigment in the eye-structures; but I have written to both to make sure, & replies up to date can be inserted.
I suppose there are probably two kinds of eye-pigment, i.e. that the pigment in the meso-blastic chromatophores (connective tissue cells I suppose one may still call them?) is different in its chemistry from the pigment of the epiblastic layer; - at any rate it may be so.
Further it is I think correct to speak of two forms (? two kinds) of pigment in the hexagonal epiblastic layer of the retina proper viz: fine needles (formerly called crystals) & granules. This is only from books, I have never seen the two kinds probably rather a special job.
Rachlmann[?] (1907) says something about them I think; & he also describes the “colourless pigment granules” in the hexagonal layer of albino eyes that Coats discovered for himself the other day in Tong’s eyes.
I think this is all for today.
Yrs very Sincerely,
E. Nettleship.
I think red hair is unusually prominent in the natives here [S. Devon]; guess only.’
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Sent toKarl Pearson
21 Sep 1911
Description:
[enclosing draft of contribution to Albinism in Man, including ‘appendix of descriptions’ of dogs (their eyes & skins), wool matches for dog hairs. Discusses poss of including coloured plate for hair, photographs of dogs]
‘Granular & diffuse pigment – I know nothing of any except granular pigment in the eye (of course having the yellow in the yellow-spot of the human retina, which does not count for our own purpose). I have never seen in the eye, either man or dog, anything at all like a uniform sort of amber staining of the albino hairs. The medieval engraving I made of Coats that you refer to was to the same effect. I am virtually certain that both C. & Usher mean granular pigment when they speak of pigment in the eye-structures; but I have written to both to make sure, & replies up to date can be inserted.
I suppose there are probably two kinds of eye-pigment, i.e. that the pigment in the meso-blastic chromatophores (connective tissue cells I suppose one may still call them?) is different in its chemistry from the pigment of the epiblastic layer; - at any rate it may be so.
Further it is I think correct to speak of two forms (? two kinds) of pigment in the hexagonal epiblastic layer of the retina proper viz: fine needles (formerly called crystals) & granules. This is only from books, I have never seen the two kinds probably rather a special job.
Rachlmann[?] (1907) says something about them I think; & he also describes the “colourless pigment granules” in the hexagonal layer of albino eyes that Coats discovered for himself the other day in Tong’s eyes.
I think this is all for today.
Yrs very Sincerely,
E. Nettleship.
I think red hair is unusually prominent in the natives here [S. Devon]; guess only.’
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