120 THE POPULAR SCIENCE MONTHLY. 



its vitality did not extend. There was vigor enough in certain of 

 its departments, especially in that of civil engineering, under the 

 charge of Professor William A. Norton ; but in such cases it was a 

 vigor due to the energy of the individual instructor, and therefore 

 almost certain to disappear whenever he disappeared. To bring these 

 scattered units into an organic whole, to build up a complete and con- 

 sistent scheme of scientific education, which should have both definite 

 and lofty aims, which should train men thoroughly in scientific meth- 

 ods, and which should continue to exist by its own inherent vitality 

 after the men who established it should have passed away all this 

 became by degrees a main work of Professor Brush's life. His energy, 

 his judgment, his executive capacity, and his devotion, soon gave him 

 the leading direction in the affairs of the institution. He was for a 

 long period its secretary ; he has always been its treasurer ; and 

 when, in 1872, a more formal organization of its faculty was felt to be 

 desirable, he was elected as its presiding officer, a position which he 

 still retains. Others have done their part toward developing various 

 departments of the school, but its growth, as a whole, the position 

 which it has acquired among scientific institutions, whatever that po- 

 sition may be, has been due to him very much more than to any other 

 one man connected with it. None are more willing to admit this than 

 the colleagues who have cooperated with him ; and it is a gratification 

 for them to have an opportunity of saying here, without his knowl- 

 edge, what would never be suffered to be printed were it submitted to 

 his inspection. 



Nor has Professor Brush been idle in his special work, in spite of 

 the exhausting demands made upon his time and thought by the man- 

 agement of the Sheffield Scientific School. The series of investigations 

 made by him on American minerals, in conjunction with Professor J. 

 Lawrence Smith, has already been mentioned. He cooperated with 

 Professor Dana in the preparation of the fifth edition of his treatise 

 on " Descriptive Mineralogy," published in 1868, and an account of his 

 special services in connection with that work will be found stated in the 

 author's preface. To the two editions preceding, as well as to this one, 

 he contributed analyses of minerals. He also edited the eighth, ninth, 

 and tenth supplements to this fifth edition, as well as the appendix to it 

 published in 1872. In 1875 he brought out also a "Manual of Deter- 

 minative Mineralogy and Blowpipe Analysis." In addition to these 

 he has been a constant contributor to the " American Journal of Sci- 

 ence," as will be seen by the following list of articles furnished by him 

 to that periodical : 



Second Series. 



Vol. x, p. 370 : " Analyses of American Spodmnene." 



Vol. xviii, p. 407 : " On the Chemical Composition of Clintonite (Scybertite) " ; 

 p. 415 : " On a new test for Zirconia." 

 Vol. xx, p. 273 : " On Prosopite." 



