CHAPTER XIV 



HELMHOLTZ IN BERLIN PHYSICAL RESEARCHES 



HELMHOLTZ occupied the Chair of Physiology 

 in Heidelberg from 1859 to 1871, when he 

 was placed in the chair of Magnus in Berlin. In 

 Heidelberg he lectured upon physiology only, and he 

 had thus greater leisure to devote to physical and 

 physiological research. During this period of eleven 

 years, he contributed nearly sixty papers, and, of these, 

 twenty-four were on physical questions. Even this 

 statement, however, does not give full expression to 

 his intellectual activity, for the great work on Physio- 

 logical Optics made its appearance in parts in 1856, 

 1860, and 1867, and the equally valuable book on 

 Sensations of Tone was published in 1863, both books 

 full of the results of special research. He also lectured 

 at the Royal Institution of Great Britain on the 

 Conservation of Energy in 1864, and, from time to 

 time, he delivered, and in 1865 and 1871 published, 

 some of those admirable popular lectures that represent 

 the highest class of that form of literature in any 

 language. 



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