another a voice within told him that he ought to set his affections on God alone. After finishing his examination of the structure of bees, he was so affected with remorse, that he gave the manuscript and drawings to a friend, careless what might happen to them. At the same time, however, he wrote two letters to Boccone, on the nature of corals. These occupations being ended, he was more powerfully impressed than ever with the vanity of human pursuits, and after this period he never engaged in his customary investigations. He acknowledged that hitherto ambition alone had incited him to undergo so many labours, but now resolved to devote the remainder of his life to the cultivation of Christian piety. Being encouraged in this resolution by the approbation of Antoinette Bourignon, he firmly adhered to it; and estimating the annual sum necessary for his subsistence at 400 Dutch florins, he endeavoured to dispose of his collections, which formed the only treasures that he possessed. For this purpose, he applied to Thevenot, who, however, was unable to find a purchaser in France. He then had recourse to another friend, Nicolas Steno, who had abjured the Protestant faith and was living at Florence, and whom he requested to represent the matter to the Grand Duke of Tuscany, in case he might feel disposed to purchase them. This person advised him to follow his example, relinquish his creed, embrace the Catholic faith, and proceed to Florence, promising that he should induce the duke to accept the offer. Swammerdam replied indignantly, that he would not sell his soul for money.