394 George Jarvis Brush. 



centers of learning. The work of Professor Brush in the 

 original study of minerals began in 1849, when he was only 

 eighteen years old. From then for twenty-live years he was 

 active, and a series of about thirty papers gives a record of the 

 results attained. In 1878 and later, he took time from his 

 absorbing administrative labors, and, in conjunction with a 

 younger colleague, published a series of papers on the newly 

 discovered locality at Branchville, Connecticut. 



In 1871 his "Manual of Determinative Mineralogy" was 

 brought out ; this contained a clear summary of blowpipe 

 methods and principles, and also a series of determinative 

 tables adapted from the German tables of von Kobell. In the 

 preparation of this work, especially the latter part, Dr. Hawes 

 took a prominent part. A revised edition was issued in 1878, 

 and later the work was entirely rewritten on an expanded scale 

 by Professor Penfield. The most important editions of the 

 book as thus revised were those of 1896 and 1898. Professor 

 Brush also made important contributions to the System of 

 Mineralogy of Professor James D. Dana. Of the ten supple- 

 ments to the fourth edition of 1854, he prepared the eighth, 

 ninth and tenth. In the preparation of the fifth edition of 

 1868, he took an important part : the statements of the blow- 

 pipe characters of the different species were written by him, 

 and in most cases the facts given were based upon his own 

 independent experiments. His close knowledge of mineralogy 

 also enabled him to aid the author at many points in the 

 prosecution of his task. The first appendix to the fifth edi- 

 tion, issued in 1872, was prepared by Professor Brush. 

 Another contribution to the science to which he was devoted 

 was the presidential address before the American Association 

 for the Advancement of Science at Montreal in 1882 ; this was 

 a thorough and valuable summary of the early history of 

 American Mineralogy. Professor Brush became an associate 

 editor of this Journal in 1863 and retained that position until 

 1879. The pages of the Journal contain about all of his 

 papers on mineralogical subjects. 



It has been shown that the influence of his early life tended 

 to turn Mr. Brush into an active business career. Fortunately 

 for the world this was not to be his life's work, but to one 

 familiar with him and what he accomplished, the influence of 

 this early training is clearly shown. He was distinctly a man 

 of affairs, of quick, sure judgment, firmness of resolution, and 

 great energy. The successive steps by which the Sheffield 

 Scientific School grew under his guidance from 1857 on show 

 at every stage his ability and his strong hand. This is not the 

 place to go into this subject in detail, but the success of this, 

 the most important work of his life, can hardly be overesti- 



