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In page W. H. R. Rivers:

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His sister Katharine wrote that when he came to visit the family, he would often sleep for the first day or two. Considering the volume of work that Rivers completed in his relatively short lifetime, Seligman wrote in 1922 that "for many years he seldom worked for more than four hours a day".[1] Rivers's biographer Richard Slobodin says that "among persons of extraordinary achievement, only Descartes seems to have put in as short a working day".[citation needed]