652 



POPULAR SCIENTIFIC LECTURES. 



The general self-respect of the students must 

 nut bo allowed to sink. If tbnt -were the 

 OIIKO, tho dangers of academic, freedom would 

 choke its blessings. It must therefore not 

 bo L--I <l<r; I v.non as pedantry-, or arrogance, if 

 the ur.i\ . -vsities are scrupulous in the admis- 

 sion of students of a different style of educa- 

 tion. It would be still more dangerous if, 

 for any extraneous reasons, teachers were in- 

 troduced into the faculty who have not the 

 complete qualifications of an independent 

 academical teacher. 



Do not forget, my dear colleagues, that you 

 are in a responsible position. You have to 

 preserve the noble inheritance of which I 

 have spoken, not only for your own people, 

 but also as a model to the widest circles of 

 humanity. You will show that youth also is 



enthusiastic, and will work for independency 

 of conviction. I say work ; for indepen- 

 dence of conviction is not the facile assump- 

 tion of untested hypotheses, but can only 

 be acquired as the fruit of conscientious in- 

 quiry and strenuous labor. You must show 

 that a conviction which you yourselves have 

 worked out is a more fruitful germ of fresh 

 insight, and a better guide for action, than 

 the best-intentioned guidance by authority. 

 Germany which in the sixteenth century 

 first revolted for the right of such conviction, 

 and gave its witness in blood is still in ths 

 van of this fight. To Germany has fallen 

 an exalted historical task, and in it you wro 

 called upon to co-operate. 



THE KND. 





CONTENTS. 



PAGE 



L O* TJW RELATION OP OPTICS TO PAINTING. 005 



1. Form COO 



2. Shade 610 



3. Color 614 



<Han.aonyo.C Color.. ,.,,.,,,,,,,,,.,,, 017 



II. ON THE ORIGIN OP THE PLANETARY SYSTEM. 



III. ON THOUGHT IN MEDICINK 



IV. ON ACADEMIC FREEDOM IN GERMAN UNIVER- 



