attention of Dr Cullen was devoted to it. it does not appear that he published any thing theoretical or practical on agriculture; but he corresponded with lord Kaimes very particularly on the subject, and the letters that transpired between them are well worthy of perusal.
Dr Cullen, about the end of the year 1749, was introduced to the earl of Islay, afterwards the duke of Argyle ; and, according to the authority of Dr Thomson, the introduction took place through the interest of lord Kaimes, who made a request to that effect through Mr Lind, the secretary to the duke. This appears from a letter addressed to Dr Cullen by Mr Martine, and which proceeds thus: "August, 1749. Mr Lind, at Mr Home's desire, talked very particularly about you to the duke of Argyle ; and your friends here desire that you will wait on his grace upon his arrival at Glasgow, which will be to-morrow evening." We are furthermore informed that the more immediate cause of Dr Cullen's being introduced to the duke of Argyle at this time, was to obtain his grace's consent and patronage to his succeeding Dr Johnstone as professor of medicine in the Glasgow university. A venerable member of the college of justice, who, in his youth, knew Dr Cullen, and remembers him well, has favoured us with the following anecdote. About this period, the duke of Argyle being confined to his room in Roseneath castle with swelled gums, sent for Dr Cullen. His grace, who was fond of dabbling occasionally in medicine, suggested a fumigation of a particular kind, and described an instrument which he thought would be suited to administer it. Dr Cullen, Avilling to humour his new patron, instantly set off for Glasgow, procured the instrument, which was made of tin, according to the fashion described, and sent it early next morning to Roseneath. The noble patient finding it adapted to the purpose required, and feeling himself better after the fumigation, was much pleased with the attention of his physician, in whose welfare he subsequently took considerable interest. The duke of Argyle had himself been educated at the university of Glasgow, had made a distinguished figure there, and had chosen the law as his profession. He afterwards studied law at Utrecht, but, on returning to Scotland, changed his determination, adopted the military profession, and became one of the most accomplished politicians of his age. By the influence of this nobleman with the crown, Dr Cullen was appointed to be the successor of Dr Johnstone in the university of Glasgow, and was formally admitted as the professor of medicine in that university, on the 2d of January, 1751.
During the residence of Dr Cullen in Glasgow, he still devoted a considerable portion of his time to chemistry, more especially investigating its application to the useful arts. He endeavoured particularly to suggest various improvements in the art of bleaching, and proposed an improved method in the manufacture or purification of common salt; which consisted in precipitating the earthy ingredients contained in the brine of sea-water, by a solution of common potash, by which a salt is obtained more pure than that prepared in the ordinary manner; but owing to this process being too expensive to be adopted in the manufacture of salt on a large scale, it has never yet been brought into general use. He wrote on this subject an essay, entitled, Remarks on Bleaching, which remains among his manuscript papers, but appears never to have been published, although a copy of it was presented to the board of trustees for the Encouragement of Fisheries, Arts, and Manufactures, in Scotland, in the records of which institution, for June, 1755, it is mentioned, that "three suits of table linen had been given as a present to Dr William Cullen for his ingenious observations on the art of bleaching."
From the period of his appointment to be professor of medicine in the university of Glasgow, until the year 1755, Dr Cullen, besides his lectures on chemis-
