xvi CONTENTS 



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Note: ' Thermodynamical Observations on Chemical 

 Processes' ... . .... 375 



Essay on ' Numbers and Measurements/ dedicated to 

 E. Zeller ... . . 377 



PRESIDENT OF THE IMPERIAL PHYSICO-TECHNICAL INSTITUTE 



(REICHSANSTALT), CHARLOTTENBURG, 1888-1894 . . 379 



1888. 'On the Intrinsic Light of the Retina/ (Physical 

 Society) ... . .... 381 



Correspondence with Heinrich Hertz .... 383 



1889. ' In memory of R. Clausius/ (Berlin Physical Society) 383 



Death of Bonders 384 



' On Atmospheric Movements/ (Berlin Academy) . . 385 

 ' On Atmospheric Movements/ Second communication. 



(Berlin Academy, and Physical Society) .... 385 



Death of his son Robert 387 



Congress of Naturalists at Heidelberg .... 388 



1890. * The Energy of the Waves and of the Wind/ (Berlin 

 Academy.) Wiedemann's Ann., XLI 390 



Representative of the University of Berlin at the Sex- 

 centennial Jubilee of the Foundation of the University of 

 Montpellier. 



'On the Work of the Imperial Physico -Technical 

 Institute* 391 



1891. ' Observations on Preparatory Training for Academical 

 Studies/ Discussions on Questions concerning Higher 

 Instruction, Berlin, Dec. 4-17 392 



' An Attempt to extend the Application of Fechner's Law 

 in the Colour System/ Zeitsch. f. Psychol. u. Physiol. d. 

 Sinnesorgane, II . . . . . . . . . 395 



'An Attempt to apply the Psycho-physical Law to the 

 Colour Differences of Trichromatic Eyes/ Zeitsch. f. 

 Psychol. u. Physiol. d. Sinnesorgane, III . . . . 396 



'Shortest Lines in the Colour System/ (Berlin 

 Academy) 397 



Celebration of his Seventieth Birthday on Nov. 2 . . 399 



1892. 'Autobiographical Notes. Address delivered at the 

 Banquet to celebrate his Seventieth Birthday/ (Berlin: 



A. Hirschwald) 400 



'The Principle of Least Action in Electrodynamics/ 

 (Berlin Academy) 401 



