PITHECOID MAN. 183 



thinking and to the greatest accuracy in the observation of mi- 

 nute phenomena. He appeared to be destined to disclose to man- 

 kind views into many hitherto hidden depths of his nature. I 

 have keenly felt the disappointment of hope caused by his death, 

 for Hertz was the one of my students who entered most fully 

 into my own circle of scientific thoughts and on whom I most con- 

 fidently relied for their future development. He has by his dis- 

 coveries secured a permanent fame in science. Not only will his 

 name live through his labors, but his lovely, noble traits of char- 

 acter, his uniform modesty, his glad recognition of the merit of 

 others, the gratitude he felt toward his teacher, will never be for- 

 gotten by any who knew him. His only thought was for the 

 truth, which he sought with extreme earnestness and all his 

 might. He was never moved by ambition or self-interest. Even 

 when he had a right to claim discoveries for himself, he was 

 rather inclined to refrain. While usually quiet and taciturn, he 

 could take an animated part in the social circle of his friends, and 

 enliven the conversation by many a pertinent word. He never 

 had a personal adversary, but he could on occasion utter a sharp 

 judgment upon slovenly work or notoriety- seeking efforts that 

 gave themselves out for science. How fully his thoughts em- 

 braced the widest views of science is illustrated in this book, the 

 last monument of his earthly effort, in which he has sought to 

 give a consecutive presentation of a system of mechanics consist- 

 ent in itself, and to deduce all the special laws of that science 

 from a single principle. Great difficulties are indeed still to be 

 overcome in the effort to explain single sections of physics from 

 the principles developed by Hertz. But as a whole his treatise 

 must interest in the highest degree every reader who can enjoy a 

 consistent system of dynamics presented in the most complete 

 and comprehensive mathematical setting. 



PITHECOID MAN. 



By Prof. E. P. EVANS. 



ON the 16th of February, 1894, Prof. Ernst Haeckel, the most 

 eminent representative of natural science and the most ar- 

 dent advocate of the doctrine of evolution in Germany, celebrated 

 his sixtieth birthday and received the congratulations of numer- 

 ous friends and pupils from far and near, who in many cases 

 emphasized the expression of their good wishes by the presenta- 

 tion of appropriate gifts. Of these tokens of friendship and 

 esteem perhaps the most suitable, as well as the most striking. 



