The Microscope. 31 



the hypoblast. Since the former have to cover a greater extent 

 than the latter, they become smaller than the others. 



PROCEEDINGS OF THE AMERICAN SOCIETY OF MI- 

 CROSCOPISTS. 



SEVENTH ANNUAL MEETING HELD AT ROCHESTER, N. Y., AUG. 19, 20, 



21, and 22, 1884. pp. 300. illus. 



A COPY of these proceedings reached us shortly after the 

 middle of last month. A lithograph of the late Robert B. 

 Tolles forms the frontispiece ; and from those who had the pleas- 

 ure of a personal acquaintance with him, we learn that the like- 

 ness is a very good one indeed. Among the more prominent of 

 the thirty papers are the following : The annual address of the 

 president, Hon. Jacob D.Cox, on "Robert B. Tolles and the Angu- 

 lar Aperture Question." This occupies nearly forty pages of the 

 proceedings and is acknowledged by all a most masterly pro- 

 duction. The article by Dr. Wm. T. Lewis, on "Hair, Micro- 

 scopically examined and medico-legally considered," is well 

 written and shows that the author has given a good deal of at- 

 tention to the subject ; but the illustrations are so poorly execu- 

 ted that they rather detract than add to the text. It is to be re- 

 gretted that such a valuable article as this could not have been 

 given first-class lithographs or fine wood cuts. On the contrary 

 we have never seen finer productions from photo-micrographs 

 than those that illustrate the paper on the structure of diatoms 

 by Pres. Cox. They are equally as good as the prints from the 

 negatives themselves. The article on " Silvering Mirrors " by 

 Dr. F. L. James, contains formulas for work and all necessary 

 directions how to proceed to deposit silver on glass and other 

 non-metallic substances. This article has been noticed quite 

 extensively in foreign journals and is received with great favor 

 at home. Mr. Edward Bausch explains why it is that objectives 

 made by one firm do not always fit into the stands made by 

 other firms, even when both use the standard " society screw." 

 He procured from the Royal Microscopical Society of London, 

 three plugs or taps. They were stamped with the initials of the 

 society and therefore were supposed to be made by the sanction 

 of the society. However, he discovered the following discrep 

 encies : 



