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Rh required of students studying for the degrees in Arts, or for any of the professions, the difficulty was to form a regular class at all. The salary paid to Sir William was £100 a year, and even this small sum was apparently only to be obtained with difficulty. The main advantage of holding the chair at all was the prospect it held out of succeeding later on to some more important office. Of Ferrier's class-work at this time we know but little. The reading requisite for the post was likely to prove useful in later days, and could not have been uncongenial; but probably in a class sometimes formed—if tradition speak aright—of one solitary student, the work of preparation would not be taken very seriously. Anyhow, there was plenty of time left to pursue his philosophic studies; and in 1844-45, when Sir William Hamilton came so near to death, Ferrier acted as his substitute, and carried on his classes with zeal and with success—a success which was warmly acknowledged by the Professor. Of course, though he conducted the examinations and other class- work, Ferrier merely read the lectures written by Hamilton; else there might, one would fancy, be found to be a lack of continuity between the deliverances of the two staunch friends but uncompromising opponents. Any differences of opinion made, however, no difference in their friendship. The distress of Ferrier on his friend's sudden paralytic seizure has already been described; to his affectionate nature it was no small thing that one for whom he had so deep a regard came so very near death's door. Every Sunday while in Edinburgh, he spent the afternoon in walking with his friend and in talking of the subjects which most interested both.