He explained that I must be sure that I really intensely desired to do scientific work, because if I went into it I must make it a serious career; that he had made enough money to enable me to take up such a career and do non-remunerative work of value if I intended to do the very best work that was in me; but that I must not dream of taking it up as a dilettante. He also gave me a piece of advice that I have always remembered, namely, that, if I was not going to earn money, I must even things up by not spending it. As he expressed it, I had to keep the fraction constant, and if I was not able
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