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24 lar medical school, Dr Cullen proposed to the faculty of the university of Glasgow, that lectures should be permitted to be given on that branch of science by himself, and Mr John Garrick, brother of the late Robert Garrick, Esq. of Hamilton, who was at that time assistant to Dr Hamilton, the professor of anatomy. These proposals having been approved, and the necessary preliminary arrangements made, the lectures on chemistry were commenced by Mr Garrick ; but he being taken ill, the remaining part of the course was delivered by Dr Cullen. In commencing his second course of chemistry, Dr Cullen printed and distributed among his students, "The plan of a course of chemical lectures and experiments, directed chiefly to the improvement of arts and manufactures, to be given in the college of Glasgow, during the session 1748." But besides these lectures, Dr Cullen, in the summer of 1748, gave lectures in conjunction with Mr Garrick, on materia medica and botany. Of the lectures delivered on materia medica only a few fragments of notes have been preserved; and these are not sufficient to afford a precise idea of the general plan which he followed. The lectures on materia medica and botany were again delivered in 1749; but how long they were delivered after that period has not been ascertained." In his lectures on botany, Dr Cullen followed the system of Linnaeus, in reference to which, in one of his lectures introductory to the practice of physic, he observes, "When a little more than thirty years ago, I first got a sight of the Botanical System of Linnaeus, the language in which it was expressed appeared to me a piece of the most uncouth jargon and minute pedantry that I had ever seen; but in length of time it became as familiar to me as my mother tongue; and with whatever difficulties this system was received in most parts of Europe, it has now surmounted these, and its utility has reconciled every person to the study of it." In thus introducing the Linnasan system of botany into the course of instruction at the university of Glasgow, Dr Cullen displayed no ordinary sagacity; for although the natural arrangements of Jussieu and Decandolle are now chiefly taught in the universities of this country, yet the artificial classification of Linnaeus was the ladder by which botanists ascended securely to the generalizations of the natural system, and is still of great use in determining generic and specific distinctions. After Dr Cullen discontinued his lectures on botany, he still pursued his botanical studies; as appears from a letter of a Danish physician, which contains the answer of Linnaeus to certain queries that had been referred to him by Dr Cullen. It does not appear from the MS. of Dr Cullen, that any intercourse was kept up after this between Linnaeus and him ; but Dr Thomson finds a letter from one of the pupils of Linnæus, requesting the introductory letters on botany which Dr Cullen had promised to Linnæus. Already it must be obvious that Dr Cullen, in devoting his attention so minutely, to so many branches of science, displayed a mind of no ordinary activity and comprehensiveness. He seems, indeed, to have felt in its full force the observation of Cicero, that " all the sciences are connected, tendering to each other a mutual illustration and assistance."

During the period that he lectured on chemistry in Glasgow, the celebrated Dr Black became his pupil; and as Dr Cullen throughout his whole career as a lecturer and as a professor, took a warm interest in the progress of every emulous student, he was not long in discovering the talents of his young pupil. Professor Robison, in his memoir of the life of Dr Black, observes, that Dr Cullen was not long in attaching Mr Black to himself in the most intimate co-operation, insomuch, that the latter was considered as an assistant in all his operations, and his experiments were frequently introduced into the lecture as good authority. Thus began a mutual confidence and friendship, which did honour both