chair of half his usual income from fees. It may also be mentioned as a curious circumstance that in those days a professor used to lose regularly many pounds a year by light money. When Lord Brougham, as a young student of chemistry in Edinburgh, paid his fee to Black, the great chemist weighed the guineas carefully on a weighing machine he had on the table before him, and observed in explanation, "I am obliged to weigh when strange students come, there being a very large number who bring light guineas, so that I should be defrauded of many pounds every year if I did not act in self-defence against this class of students."[36] Smith kept an occasional boarder in his house, and would of course make a trifle by that, but his regular income from his class work would not exceed L170 a year. L170 a year, however, was a very respectable income at a period when, as was the case in 1750, only twenty-nine ministers in all broad Scotland had as much as L100 a year, and the highest stipend in the Church was only L138.[37] Besides his salary Smith had a house in the College--one of those new manses in the Professors' Court which Glasgow people at the time considered very grand; and though the circumstance is trifling, it is a little curious that he changed his house three times in the course of his thirteen years' professorship. It was the custom when a house fell vacant for the professors to get their choice of it in the order of their academical seniority. There seems to have been no compulsion about the step, so that it is not beneath noticing that Smith should in so short a term have elected to make the three removes which proverbial wisdom deprecates. When his friend Cullen was translated to Edinburgh in 1756, Smith, who was next in seniority, having been made professor in Glasgow a few months after the eminent physician, removed to Cullen's house; then he quitted this house in 1757 for the house of Dr. Dick, Professor of Natural Philosophy, who died in that year; and he left Dick's house in turn for Dr. Leechman's, on the promotion of that divine to the Principalship in 1762. These houses are now demolished with the rest of the old College of Glasgow, so that we cannot mark the gradation of comfort that may have determined these successive changes; and besides they may have been determined by no positive preference of the economist himself, but by the desires of his mother and his aunt, Miss Jane Douglas, who both lived with him in Glasgow, and whose smallest wishes it was the highest ambition of his affectionate nature to gratify.