THE AMERICAN 



MONTHLY 



MICROSCOPICAL JOURNAL 



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



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



CONTENTS. 



About Stands and Accessories, Tatham 201-206 



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

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



Washing; Cross-sections; Mountiug, 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 



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

 Microscopical Manipulation. — Micro-diagnosis of Tra- 

 choma, E pulsions and Emulsifiers, Staining Tissues 224-226 



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



Medical Microscopy. — Plague Serum as a Therapuetic 



Agent, the Cancer Microbes 227-228 



Microscopical 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 than 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 



