|Alternative reference number||NLB/42 p3|
|Title||Copy letter from Robert William Frederick Harrison to The Secretary, The Imperial Merchant Service Guild, The Arcade, Lord Street, Liverpool|
|Date||4 March 1909|
|Description||'Dear Sir, |
The paper by Sir William Abney about which you enquire is not yet published. It was read only last week. It is entitled "Colour-blindness and the trichromatic theory of colour vision". It will be published in a week on two in the Proceedings of the [Royal] Society, but will not then be on [ale] separately, but only in the No. in which it appears with other papers. I might perhaps suggest that if you desire separate copies your best plan would be to apply to the author direct, as he will be furnished with a considerable number of copies for private distribution.'