two passed in discourse, I went to my study till dinner; beginning with some philosophical work, such as the logic of Port-Royal, Locke's Essays, Mallebranche, Leibtnitz, Descartes, etc. I soon found that these authors perpetually contradict each other, and formed the chimerical project of reconciling them, which cost me much labor and loss of time, bewildering my head without any profit. At length (renouncing this idea) I adopted one infinitely more profitable, to which I attribute all the progress I have since made, notwithstanding the defects of my capacity; for 'tis certain I had very little for study. On reading each author, I acquired a habit of following all his ideas, without suffering my own or those of any other writer to interfere with them, or entering into any dispute on their utility. I said to myself, "I will begin by laying up a stock of ideas, true or false, but clearly conceived, till my understanding shall be sufficiently furnished to enable me to compare and make choice of those that are most estimable." I am sensible this method is not without its inconveniences, but it succeeded in furnishing me with a fund of instruction. Having passed some years in thinking after others, without reflection, and almost without reasoning, I found myself possessed of sufficient materials to set about thinking on my own account, and when journeys of business deprived me of the opportunities of consulting books, I amused myself with recollecting and comparing what I had read, weighing every opinion on the balance of reason, and frequently judging my masters. Though it was late before I began to exercise my judicial faculties, I have not discovered that they had lost their vigor, and on publishing my own ideas, have never been accused of being a servile disciple or of swearing 'in verba magistri'.
From these studies I passed to the elements of geometry, for I never went further, forcing my weak memory to retain them by going the same ground a hundred and a hundred times over. I did not admire Euclid, who rather seeks a chain of demonstration than a connection of ideas: I preferred the geometry of Father Lama, who from that time became one of my favorite authors, and whose works I yet read with pleasure. Algebra followed, and Father Lama was still my guide: when I made some progress, I perused Father Reynaud's Science of Calculation, and then his Analysis Demonstrated; but I never went far enough thoroughly to under-
