In the summer of 1809, after a short journey to Cadiz, Lord Holland and his party crossed the plains of Estremadura on mules to Lisbon and embarked for England, though not without an unexpected delay caused by a slight attack of fever on the part of Lord John. On the voyage back Lord Holland and his secretary, Mr. Allen, pointed out to him the advantages of going to Edinburgh for the next winter, and in a letter to his father, dated Spithead, August 10, 1809, he adds: 'They say that I am yet too young to go to an English university; that I should learn more there [Edinburgh] in the meantime than I should anywhere else.' He goes on to state that he is convinced by their arguments, in spite of the fact that he had previously expressed 'so much dislike to an academical career in Edinburgh.' The truth is, Lord John wished to follow his elder brother, Lord Tavistock, to Cambridge; but the Duke would not hear of the idea, and bluntly declared that nothing at that time was to be learnt at the English universities. On his return to England it was decided to send Lord John to continue his studies at Edinburgh University. The Northern Athens at that time was full of keen and varied intellectual life, and the young student could scarcely have set foot in it at a more auspicious moment. Other cadets of the English aristocracy, such as Lord Webb Seymour and Lord Henry Petty, were attracted at this period to the Northern university, partly by the restrictive statutes of Oxford and Cambridge, but still more by the genius and learning of men like Dugald Stewart and John Playfair. The Duke of Bedford placed his son under the roof of the latter, who at that time held the chair of mathematics in the university, with the request that he would take a general oversight of his studies. Professor Playfair was a teacher who quickened to a remarkable extent the powers of his pupils, and at the same time by his own estimable qualities won their affection. Looking back in after-years, Lord John declared that 'Professor Playfair was one of the most delightful of men and very zealous lover of liberty.' He adds that the simplicity of the distinguished mathematician, as well as the elevation of his sentiments, was remarkable.