THE AMERICAN 



MONTHLY 



MICROSCOPICAL JOURNAL. 



Entered *t the post-office as second-class matter. 



VOL, XXI, APRIL, 1900. NO, 4, 



CONTENTS. 



Formaldehyde as a Killing and Fixing Agent. Carter. With 



Frontispiece 93-96 



Notes dy J. H. Cooke. — Light ; Herrings ; Pork ; A Show- 

 Slide ; Action of Bacteria on Leguminosa^ ; Aphides ; Heron- 



ite ; Resolution; Formalin ; Diatoms ; Plant Histology 96-100 



Evolution of the Bacillaria. Edwards 101-109 



Biological Notes — Pammel. — Hybrid Citrus, Tubercular 

 Infection ; Red Color of Plants ; Heteroecius Rusts ; Apple 



Canker ; Udder Bacteria 110-112 



Notes bv F. S. Scales. — QuekettClub; New Objectives 112-113 



Postal Club Slides. — Onyx; Jade; Isolated Slide ; Putrefac- 

 tive Bacteria ; Locating Objects ; Fish Scales ; Mounting.. 114-118 



Microscopical Societies.— Quekett Club 118-119 



New Publications. — Bacteriology ; Botany ; Chats about the 



Microscope 119-121 



Miscellaneous. — Vermin, Dust, Slides, Diatoms Wanted..... 121-122 



Formaldehyde as a Killing and Fixing Agent. 



TRUMAN P. CARTER, 



Professor of Natural Science In Illinois College, 

 Jacksonville, Illinois. 



\X/ith Frontispiece, 



Formaldehyde as a preservative has justly a very wide- 

 spread use, but as a killing and fixing agent for histolog- 

 ical purposes its use is much more limited than it is des- 

 tined to be. My faith in formaldehyde as a killing and 

 fixing agent dates back more than a year, when my at- 

 tention was called to the very perfect condition of some 

 tissues which had been kept for some time in a ten per 



