At this time he changed his name to Ray, omitting the initial letter; the altered mode of spelling being, as he conceived, more correct. In one of his notes to Dr Lister he mentions his having had an offer of L.100 per annum to travel with three young noblemen, expressing, at the same time, his unfitness for the office, and his unworthiness of so large a salary. To this his friend replies: "I joy you of the condition offered you. If you accept it, I wish you all the satisfaction and comfort in the world of it; and I pray God, of his infinite mercy, to preserve you in your travels, and to send me home again my dear friend well. Fix not long with them in any place; for the gentry of France are very proud, and will soon (when acquainted) learn them to despise their tutors, however well deserving." This proposal, however, Mr Ray rejected, being in a weak state of health, and considering it more expedient to continue his pursuits. In the spring of 1671, he had an attack of jaundice, of which, as he informs Dr Lister, he "got pretty well rid." On recovering, he pursued his experiments on the motion of sap, and in summer visited several of his acquaintances; after which, in July, he commenced a journey to the northern counties, taking with him Thomas Willisel, from whose assistance in collecting and describing plants he derived much profit. In this erratic mode of living,--at one time wandering over the country in quest of its rarer productions, at another residing with his friends at their country-seats, enjoying their conversation, and deriving instruction from the inspection of their collections,--Mr Ray must have experienced much real happiness; one principal source of which, however, was now dried up. He had scarcely returned from his excursion when he was informed of the dangerous illness of Mr Willughby, who, having been seized with violent pain in his head, followed by pleurisy and fever, expired in the thirty-seventh year of his age, on the third day of July 1672.