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formation, position of the vaso-motor centre, course of vaso-motor 

 nerves, perfusion of blood through excised organs, the puncture 

 method in histology, &c, are but a few of the many problems that he 



CAEL LUDWIG. 



followed successfully. Every one of his many pupils — pupils 

 numbering over three hundred — of all nationalities, fell under the 

 influence of his enchanting personality. 



E. DU BOIS-REYMOND. 



1818-1896. 



DU BOIS, as he was often called, of Swiss and Huguenot 

 extraction, was born at Berlin, studied at Bonn, and also at 

 Berlin, where in 1840 he was assistant to J. Midler, and in 

 1858 succeeded his master in the Chair of Physiology. His work lies 

 in a limited territory. At Midler's instigation he investigated the 

 "frog current" of Nobili. In 1875, thirty-four years after this 

 event, he was still busy in seeking an answer to the problem. He 



