Yet I did not lose myself in empty fancies; on the contrary, I kept my practical work constantly before my eyes. From thinking about my dead parents my thoughts would wander back over the rest of my family, turning most often to that dear eldest brother of mine, who has now not been referred to for some time in these pages. He had become the faithful watchful father of several children. I shared in his unaffected fatherly cares, and my soul was penetrated with the desire that he might be able to give his sons such an education as I should feel obliged to point out to him as being the best. Already, ever since I was at Frankfurt, I had communicated to him my thoughts on education and methods of teaching. What now occurred to me out of my new knowledge as applicable to his case, I extracted, collected together, and classified, so as to be able to impart it to him for his use at the first opportunity. One thing which greatly contributed to the better consideration and elucidation of the Pestalozzian mode of teaching was the presence of a large number of young men sent from various governments as students to Yverdon. With some of these I was on terms of intimacy, and to the exchange of ideas which went on amongst us I owe at least as much as to my own observation. On the whole I passed a glorious time at Yverdon, elevated in tone, and critically decisive for my after life. At its close, however, I felt more clearly than ever the deficiency of inner unity and interdependence, as well as of outward comprehensiveness and thoroughness in the teaching there. To obtain the means of a satisfactory judgment upon the best method of teaching the classical tongues, I took Greek and Latin under a young German, who was staying there at that time; but I was constructing a method of my own all the while, by observing all the points which seemed valuable, as they occurred in actual teaching. But the want of a satisfactory presentation of the classical tongues as part of the general means of education and culture of mankind, especially when added to the want of a consideration of natural history as a comprehensive and necessary means of education, and above all the uncertain wavering of the ground-principles on which the whole education and teaching rested at Yverdon, decided me not only to take my pupils back to their parents' house, but to abandon altogether my present educational work, in order to equip myself, by renewed study at some German university, with that due knowledge of natural science which now seemed to me quite indispensable for an educator. In the year 1810 I returned from Yverdon by Bern, Schaffhausen, and Stuttgart to Frankfurt.