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one of the great names in the history of science, is the subject of a sympathetic and dignified biography prepared by Dr. Leo Koenigsberger and published in three volumes by Vieweg.



The interests of von Helmholtz were so far-reaching, his activities so multifarious and his intellect so profound that the preparation of an adequate memoir was a task of unusual difficulty. It is fortunate that it has been so adequately performed. Hermann Ludwig