[46] Yule’s colour-blindness was one of the cases in which Dalton, the
    original investigator of this optical defect, took special interest. 
    At a later date (1859) he sent Yule, through Professor Wilson, skeins
    of coloured silks to name.  Yule’s elder brother Robert had the same
    peculiarity of sight, and it was also present in two earlier and two
    later generations of their mother’s family—­making five generations in
    all.  But in no case did it pass from parent to child, always passing
    in these examples, by a sort of Knight’s move, from uncle to nephew. 
    Another peculiarity of Yule’s more difficult to describe was the
    instinctive association of certain architectural forms or images with
    the days of the week.  He once, and once only (in 1843), met another
    person, a lady who was a perfect stranger, with the same peculiarity. 
    About 1878-79 he contributed some notes on this obscure subject to one
    of the newspapers, in connection with the researches of Mr. Francis
    Galton, on Visualisation, but the particulars are not now accessible.

[47] From Yule’s verses on her grave.

[48] Lord Canning to Lady Clanricarde:  Letter dated Barrackpoor, 19th Nov.
    1861, 7 A.M., printed in Two Noble Lives, by A. J. C. Hare, and here
    reproduced by Mr. Hare’s permission.

[49] Lord Canning’s letter to Lady Clanricarde.  He gave to Yule Lady
    Canning’s own silver drinking-cup, which she had constantly used.  It
    is carefully treasured, with other Canning and Dalhousie relics, by
    the present writer.

[50] Many years later Yule wrote of Lord Canning as follows:  “He had his
    defects, no doubt.  He had not at first that entire grasp of the
    situation that was wanted at such a time of crisis.  But there is a
    virtue which in these days seems unknown to Parliamentary statesmen in
    England—­Magnanimity.  Lord Canning was an English statesman, and he
    was surpassingly magnanimous.  There is another virtue which in Holy
    Writ is taken as the type and sum of all righteousness—­Justice—­and
    he was eminently just.  The misuse of special powers granted early in
    the Mutiny called for Lord Canning’s interference, and the consequence
    was a flood of savage abuse; the violence and bitterness of which it
    is now hard to realise.” (Quarterly Review, April, 1883, p. 306.)

[51] During the next ten years Yule continued to visit London annually for
    two or three months in the spring or early summer.

[52] Now in the writer’s possession.  They appear in the well-known
     portrait of Lord Canning reading a despatch.

[53] Lord Canning’s recommendation had been mislaid, and the India Office
    was disposed to ignore it.  It was Lord Canning’s old friend and Eton
    chum, Lord Granville, who obtained this tardy justice for Yule,
    instigated thereto by that most faithful friend, Sir Roderick
    Murchison.