K. Pearson to E. Nettleship, 13th Jan. 1911.- External URL
- Correspondence Details
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Sent From (Definite): Karl PearsonSent To (Definite): Edward NettleshipDate: 13 Jan 1911
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Holder (Definite): University College London: Special Collections
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Sent fromKarl Pearson
13 Jan 1911
Description:
‘...
Whether the hair from the spectacle mark would be free from pigment if very long & thoroughly washed I do not know. It is difficult to assert that a dye would entirely disappear under alcohol treatment, for we have no reason to suppose it confined to the surface. The hairs are always wet & stain any cloth with which they are rubbed. It is quite easy to see it is not dirt but actual dye. Most of it disappears with the alcohol washing.
It would not be easy to say that any albino is without diffused pigment in the hair, certainly most human albinos have it & the peculiarity if an albino is absence of granular pigment not of diffused pigment. The black hairs from the mask of the normal Pekinese are leaded with pigment granules – there are absolutely none in the spectacle marks of these albinos. I should not like to say that even Tong was without diffused pigment in the hair; she certainly had no granular pigment. Remember that this diffused pigment is only apparent colouring seen under a relatively low power. It is usually invisible with a high power. There would be no means of distinguishing between a little diffused pigment such as is manifested in these dogs & in most human albinos, especially in the summer and any dye in these hairs.
Before the hair is put under the microscope, it does not look... [continued – image missing from photos]’
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Sent toEdward Nettleship
13 Jan 1911
Description:
‘...
Whether the hair from the spectacle mark would be free from pigment if very long & thoroughly washed I do not know. It is difficult to assert that a dye would entirely disappear under alcohol treatment, for we have no reason to suppose it confined to the surface. The hairs are always wet & stain any cloth with which they are rubbed. It is quite easy to see it is not dirt but actual dye. Most of it disappears with the alcohol washing.
It would not be easy to say that any albino is without diffused pigment in the hair, certainly most human albinos have it & the peculiarity if an albino is absence of granular pigment not of diffused pigment. The black hairs from the mask of the normal Pekinese are leaded with pigment granules – there are absolutely none in the spectacle marks of these albinos. I should not like to say that even Tong was without diffused pigment in the hair; she certainly had no granular pigment. Remember that this diffused pigment is only apparent colouring seen under a relatively low power. It is usually invisible with a high power. There would be no means of distinguishing between a little diffused pigment such as is manifested in these dogs & in most human albinos, especially in the summer and any dye in these hairs.
Before the hair is put under the microscope, it does not look... [continued – image missing from photos]’
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