HERMANN VON HELMHOLTZ.
Hermann von Helmholtz, 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