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arithmetic, perhaps because of his poor visual powers; but he managed to avoid being outclassed by Plaxy, who was none too good herself. His spelling, too, was very bad, probably for the same reason. But at an early age he showed a great interest in language and the art of precise expression. Poetry had sometimes a deep effect on him. In spite of his visual weakness he read a good deal, and he often begged members of the family to read aloud to him. This they did very frequently, knowing how great a boon it was for him.
    But to return to his puppyhood. There came a time when it seemed desirable for Plaxy to attend the village school. Sirius, of course, could not do so. It was sometimes with thankfulness for his freedom, but sometimes with envy, that he watched his little foster-sister set off with her books in the morning. He was now of an age to do a great deal of free roaming, and the passion for the scents and adventures of the countryside was now strong in him. But the thought that Plaxy was outstripping him in knowledge of the great world of men worried him sorely. In the afternoons, when she returned from school, she often assured him that lessons were a bore; but he could tell from her tone that she felt important and proud, and that a good deal that happened at school was great fun. He made a habit of gleaning from her the most useful bits of information that she had acquired during the day. It became a regular custom with her to do her homework with him, to the profit of them both. Meanwhile Elizabeth continued Sirius's education in a desultory but stimulating way. Often he was able to pay his debt to Plaxy by passing on to her the fruits of his own lessons, though she generally adopted a superior attitude to his tit-bits. Sometimes he told her about conversations with Thomas, who had made a habit of taking Sirius for walks on the hills and telling him all sorts of significant scraps of science or world-history. Plaxy herself, of course, was sometimes present on these walks. But generally Thomas needed vigorous exercise at the week-ends, and his little daughter could not keep up with him as well as Sirius. During his puppyhood Sirius often came home tired after long expeditions with Thomas, but when he reached mid-adolescence he used to look forward with pleasure to the almost weekly trek over Arenig, the Rhinogs or Moelwyn, listening to the far-ranging flow of Thomas's thought, or probing him with questions. These the great physiologist answered with all the patience and care which he was accustomed to give to his students. This was Sirius's main intellectual education, this frequent contact with a mature and brilliant mind. Often the two would discuss Sirius's future, Thomas encouraging him to believe that a great work lay before him. But of this later, I have let myself pass beyond the dog's puppyhood, and now I must return to it.
    Not only in reading and writing but in another way also Sirius was inevitably inferior to Plaxy, and indeed to nearly all human beings. He was entirely colour-blind. I understand that there is still doubt about colour-sensitivity in dogs. Dissection, I believe, has revealed that they have approximately the same equipment of "rods and cones" in their retinae as that of human beings. But psychological experiments have not yet proved that dogs are in fact sensitive to colour. Possibly the truth is that, though some dogs are aware of colour, the incidence of colour-blindness in the canine species is much greater than in man. However that may be, it is certain that Sirius was completely colour-blind. Until quite late in his puppyhood, long after he had learned to talk, he himself had no suspicion that his seeing lacked any qualities possessed by Plaxy's. Thomas had told Elizabeth that dogs were almost certainly colour-blind, but she refused to believe it of Sirius, insisting that he could distinguish between her differently coloured dresses. "No," said Thomas, "he probably does it by scent or