THE AMERICAN 



MONTHLY 



MICROSCOPICAL JOURNAL. 



Entered at the post-oftice as second-class matter. 



VOL. XX. JULY, 1899. NO. 7, 



CONTENTS. 



About Stands and AccessorieF. Tathatn 201-206 



Notes on Microscopy, Oooke. Against Rust; Yeast; Ob- 

 jectives; Fibres; Section-lifter; Rock-powder ; Varnish ; 



Washing; Cross-sections; Mounting, 207-210 



The Celloidin Process of Section-cutting. Walker 210-218 



A Method of Making Type Slides for Opaque Objects with 



Removable Cover. Sco't. .Illustrated 218-221 



A Spherical Rotifer. With Frontispiece 222-223 



UdiTorial. — Adulteration of Insect Powder, Double Serum .. 223-224 

 MiCRoscoPiCAi, Manipulation. — Micro-diagnosis of Tra- 

 choma, E ..ulsions and Emulsifiers, Staining Tissues 224-226 



BacterioIyOGy. — Tuberculosis of the Queen's Cows ^ 226-227 



Medical Microscopy. — Plague Serum as a Therapuetic 



Agent, the Cancer Microbes 227-228 



Microscopicai. Societies.— Royal Microscopical Society, 



Quekett Club 228-229 



New Publications. — The Scientific Skeleton 230 



Microscopical Notes. — Bloody Water, Bleaching 23c 



About Stands and Accessories. 



JOHN W. TATHAM, M. D. 



We hear a great deal nowadays about a very common 

 type of instrument to which the title -'student's micro- 

 scope" has been accorded, with more liberality thnn jus- 

 tice, as it seems to me. The instrument of the class to 

 which this name has been given, consists invariably of a 

 small stand, approximating more or less closely to the 

 Continental model, with a short tube, of small diameter, 

 a stage inconveniently near the table, and where a con- 

 denser is included, this is generally of the so-called Abbe 

 chromatic form, which is either made to slide in a rigid 



