370 The Microscope. 



in 1877, and liis work in this department has received universal 

 recognition. The literary work accomplished by him in connection 

 with his scientific studies was simply enormous. Up to January I, 

 1882, no less than 1,063 titles were accredited to him, and in addi- 

 tion to these were his translation and editing of the famous 

 Iconographic Encyclopedia in 1852, 4 vols., besides two large ones 

 of accompanying engravings; " Catalogue of North American Rep- 

 tiles"; "Mammals of North America"; "The Birds of North 

 America"; "The Distribution and Migration of North American 

 Birds," 5 vols. ; and yet others, whose names and titles we do not 

 recall. 



For forty years he gave his life to the Smithsonian Institute, 

 and it may be there said of him, as of Sir Christopher Wren, in St. 

 Paul's: "If any one inquires after his monument, let him only look 

 around him." We might add much more to this article pertaining 

 to the life, habits and social qualities of this remarkable friend and 

 devotee of the natural sciences, but want of space forbids. We 

 can only say: "Well done, thou faithful laborer. We accept with 

 gratitude the rich fruitage of thy toil, while we utter over thy pre- 

 mature grave a reluctant farewell." 



Acknowledgments. — -From Dr. Thomas Taylor, Washington, 

 D. C, slides of fat from human kidney; Prof. W. S. Jackman, 

 Pittsburg, Pa., slide of tape worm; Prof. Whelpley, St. Louis, 

 Mo., for courtesies; H. J. Detmers, excellent photograph of A. 

 pellucidaif taken by lamp-light with a Spencer yV i^- iiom. lense, 

 Beck's No. 2 eye-piece, Bullock's professional stand. In the second 

 photograph ToUes' -^j in. horn, lense, with the same eye-piece as in 

 the first, exposure twenty and twenty-five minutes respectively. 

 We give these details for the reason that these photographs were 

 made with American lenses, and are as fine as any we have ever 

 seen. Van Heuck's well-known plates have no mean rival in these 

 photographs by Dr. Detmers; we have received from Mr. Jas. B. 

 Shearer of Bay City, Mich., a large number of mounted photomicro- 

 graphs. In a former number we expressed our admiration of his 

 work, which is fully confirmed by these latest arrivals. The mount- 

 ing-card is a new feature, which, as one of our correspondents puts 

 it, needs to be seen to be appreciated. 



