But careful gradation was not the only marked reform carried out at Saros-Patak during this period. Pictures were introduced as aids in teaching, and the first child’s picture book, the first of a long line of books so popular in our own day, was written. This was the famous _Orbis pictus_, to be discussed in a subsequent chapter. Comenius returned to Lissa in 1654, to resume his ecclesiastical labors. But his sojourn was brief; for, with the invasion of Poland by the Swedes, came the fall and conflagration of the city. Comenius escaped, “almost in a state of nudity,” to use his own words. He had not only lost his property and his library in the conflagration, but he had sustained a yet greater loss in the burning of his numerous manuscripts, and, more important (to him) than all the others, his entire pansophic work, on the composition of which he had labored so arduously for many years. Writing to Montanus, he says, “The loss of this work I shall cease to lament only when I cease to breathe.” He escaped from Lissa to Silesia, where he found refuge for a time in the home of a nobleman. He shortly afterward pushed on to Frankfort, but not feeling secure here he moved to Hamburg, where for two months he was prostrated by a severe illness. CHAPTER V CLOSING YEARS: 1656–1670 Flight to Amsterdam—Reception by Lawrence de Geer—Religious freedom in Holland—Publication of the complete edition of his writings—Other educational activities—The “One thing needful”—Death at Amsterdam and burial at Naärden—Family history of Comenius—Alleged call to the presidency of Harvard College—Portraits—Personal characteristics. During his last year’s residence at Saros-Patak, Comenius had sustained a great loss in the death of his friend and former patron, Lewis de Geer. In a funeral oration which he composed, he characterized his benefactor as “a man pious toward God, just toward men, merciful to the distressed, and meritoriously great and illustrious among all men.” The rich Dutch merchant bequeathed his estates to his son, Lawrence de Geer of Amsterdam; and not only his estates, but also his deep interest in the welfare of the Moravian reformer. Learning of the severe illness of Comenius, Lawrence de Geer wrote him to leave Hamburg and come directly to Amsterdam, where all the needs of his closing years would be provided. The younger de Geer, it would seem, had not only a real and profound affection for the aged Comenius, but also a keen and intelligent interest in all his schemes for educational reform.