SAMUEL AVEXDKLL WILLISTON. 423 



Recent and Fossil." This lie l)e<i:an in 1917, and it is most unfortunate 

 for both paleontologic and zoologic science that the many facts stored 

 in his mind on this subject could not have found expression. Thoufi;h 

 Williston's work concerned itself principally with the ancient reptilian 

 life of what is now central and southern I'nited States, he also j^uh- 

 lished researches upon sedimentary rocks, ^lesozoic fish, ( "enozoic 

 mannnals, including man, and especially upon the living Diptera. 

 When associated with Professor IVIarsh, Williston despaired of pub- 

 lishing researches in paleontology, so he turned his actively obser\ing 

 mind upon the living flies. His interest in this subject continued to 

 his death, though after 1S99 he published in it only occasional papers. 

 Between 1879 and 1899 his listed papers in Diptera total sixty-seven, 

 amongst which is his "Manual of North American Diptera," a book 

 still essential to workers along this line. 



To all of us who \vd\e known Professor Williston the memory of 

 him is helpful and inspiring. The waiter has cause to remember 

 especially his genial friendliness which expressed itself in most cordial 

 generosity with original sketches and notes, — an aid which was 

 extended at a time when Williston's thoughts were absorl)ed in anxious 

 care of a much loved daughter. When a truly great man passes, his 

 memory endures among his friends, not so much for the material 

 and mental achievements he has accomplished, as for the spirit and 

 inspiration of his ser^■ice. 



Hervey WooDBi rn Shimer. 



