One circumstance Locke noticed much to the advantage of the foreigners, namely, their good-natured toleration for each other's opinions. Writing to Boyle, he says-- "The distance in their churches gets not into their houses. They quietly permit one another to choose their way to heaven; for I cannot observe any quarrels or animosities amongst them upon the account of religion. This good correspondence is owing partly to the power of the magistrate, and partly to the prudence and good-nature of the people, who, as I find by inquiring, entertain different opinions without any secret hatred or rancour." And though, like most Englishmen, of decided Protestant convictions, travelling on the Continent for the first time, Locke indulged in a good deal of merriment at the Catholic ceremonies, he pays, in one of his letters to Strachey, a cheerful tribute to the personal worth of the Catholic priests. He had not met, he says, with any people so good-natured or so civil, and he had received many courtesies from them, which he should always gratefully acknowledge. * * * * * Locke returned to England towards the end of February, 1665-66, and was at once offered the post of secretary to the Earl of Sandwich, who was on the point of setting out as ambassador to Spain. He wavered for a short time, but, though doubtful whether he had not "let slip the minute that they say every one has once in his life to make himself," he finally declined the offer. Before settling down again in Oxford, he spent a few weeks in Somersetshire, paying probably, amongst other visits, one he had promised himself to Strachey at Sutton Court, "a greater rarity than my travels have afforded me; for one may go a long way before one meets a friend." During his stay in Somersetshire, he attempted to try some experiments in the Mendip lead-mines with a barometer which had been sent to him for the purpose by Boyle. But the miners and their wives made a successful resistance. "The sight of the engine and my desire of going down some of their gruffs gave them terrible apprehensions. The women, too, were alarmed, and think us still either projectors or conjurors." At the beginning of May, Locke was again in his rooms in Oxford. He seems to have lost no time in setting to work afresh on the studies which might qualify him to exercise the profession of medicine. In his letters to Boyle, he makes frequent reference to chemical experiments and to collecting plants for medical purposes.