43 8 HERMANN VON HELMHOLTZ 



his friend's memory), ' will realize and retain the outward 

 features of Helmholtz from the pictures and busts of the first 

 artists of Germany. For those unacquainted with Jiim it may 

 be said that the external aspect wholly corresponded with the 

 greatness of his mind. His skull was immense, but perfect in 

 form ; his splendid eyes did not betray the effort they had 

 endured unscathed in subjective experiments, while the delicacy 

 and refinement of the lower half of his face revealed the 

 subtlety of his intellect. He was of a dark complexion, above 

 the middle height, and powerfully built, with a noble bearing/ 



After the Commemoration the Emperor informed the Minister 

 von Delbriick that it was his intention that a public memorial 

 should immediately be erected, to Helmholtz, towards whkh he 

 would contribute 10,000 marks, and grant a site, 



Helmholtz had consented, shortly before Easter, 1892, at the 

 request of his pupils, to publish the Lectures in Mathematical 

 Physics, which he had delivered at the University of Berlin, 

 and had revised certain portions of them before his death in 1894, 

 although' they were not ready for the press. These were sub- 

 sequently edited by his distinguished pupils A. Koenig, O. Kri- 

 gar-Menzel, C. Runge, and F. Richarz, and constitute the most 

 important textbook for certain departments of mathematical 

 physics. 



Before his death, Helmholtz had also seen in type some 

 two-thirds of Vol. iii of his Wissenschaftliche Abhandlungen 

 (Scientific Papers), which appeared in the following year; and 

 the printing of the Fourth Edition of his Vortrdge und Reden 

 (Essays and Addresses), which was only published in 1896, had 

 just begun when he died. 



The Head of the Central Committee in charge of the erection 

 of the Monument was Rudolph von Delbriick, ' the last witness 

 himself now dead of that glorious epoch of our race.' 

 The man in whom Dryander applauded ' the might of his all- 

 conquering intellect, the lucidity of his mind, which penetrated 

 all confusions, the marvellous and enlightened composure of his 

 wisdom ', was for two decades among the truest friends and 

 most devoted adherents of Helmholtz. Accordingly, both he 

 and Arthur Koenig, Helmholtz's pupil and collaborator, gladly 

 took up the task assigned to them by the Emperor. 



The unveiling of the Monument, for which the Emperor 



