that may be desired are not to be compared to her," he left his business in the charge of a manager, and devoted himself to study. He wrote a book to show that Cartesianism did not lead to atheism, but was, on the contrary, quite compatible with the Christian religion. Spinoza seems to have helped him in the composition of this book. Jelles was one of the friends who persuaded Spinoza to publish his version of Descartes' Principia, and even defrayed the cost of its publication. He also took an active share in the publication of Spinoza's posthumous works, the preface to which is so similar in tone to the book of Jelles that he is regarded as its author by some very competent authorities.
Dirck Kerckrinck was seven years younger than Spinoza, whom he first met at Van den Enden's school (? 1652-6). He studied medicine, and became the author of various medical treatises. Colerus relates some gossip to the effect that Spinoza and Kerckrinck were rivals for the hand of Clara Maria, the gifted daughter of Van den Enden, and that she accepted Kerckrinck because he was rich, while Spinoza was poor. But as Clara Maria was born in 1644, this very natural attempt to introduce a touch of romance into Spinoza's life of single blessedness is an utter failure. Clara Maria was barely sixteen when Spinoza left Amsterdam for good in 1660, and he had ceased to be her father's pupil in 1654 or, at the latest, in 1656. As an inmate in her father's house he may have been fond of her as a mere child, and some expression of endearment uttered in that sense probably gave rise to this pretty tale. It is true, however, that Kerckrinck did marry her in 1671, as already mentioned. Spinoza possessed several of the medical works of Kerckrinck, who had, no doubt, sent them to him as an old friend of his.
Lodewijk Meyer was a medical practitioner in Amsterdam. He was about two years older than Spinoza, and a man of versatile talents. He had studied not only medicine but
