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Several friends suggested that I should issue my Presidential address in pamphlet form. I thought it might be useful to do this if it could be accompanied by the data (which had been published in “ Nature”) on which
large part of the address is based. I therefore begged Messrs. Macmillan and the writers of the articles to grant me permission to reprint certain parts of them. This was at once given, and I have to express my best thanks for the favour thus extended to me.
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1. The German Universities