THE AMERICAN 



MONTHLY 



MICROSCOPICAL JOURNAL. 



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



VOL, XXI. NOVEMBER, 1900. NO, 11. 



CONTENTS . 



Ob a Direct Method of Demonstrating the Muscular Function 



of the Diatom. Cunningham 299-305 



A Few Notes on the Microscope in the Drug Store. Whelpley. 305-308 



Collection, Preservation, Staining and Mounting, Tube-casts, 

 Urinary Deposits, etc 308-310 



Photo-Micrographic Apparatus. Penny 310-314 



Extracts from English P. M. Society's Note-Books ; Podura 

 and other Scales. Bryan. 314-319 



Notes by Shillington Scales.— Mosquitoes and Malaria ; 

 Role of Insects as Disease carriers ; Regeneration of Earth- 

 worms ; Artemia ; Mechanical Stage ; Mounting in Balsam ; 

 in Glycerine ; Ringing. 319-326 



Manual of Clinical Diagnosis. Simon. 326 



On a Direct Method of Demonstrating the Muscular 

 Function of the Diatom. 



K. M. CUNNINCHAM. 



During the month of May, 1897, 1 had opportunities for 

 prosecuting some studies in relation to diatom biology, 

 being a continuation of previous efforts successively re- 

 ported upon, and as some recent expedients led me to 

 results of unusual interest, I have thought proper to re- 

 port the same. 



For at least five years antecedently, I had become inter- 

 ested in the study of the structure of decayed woody sub- 

 stances, and in the course of the study, I found out that 

 if a piece of dry, decayed wood was crushed into a fine 

 powder; and that if the rays of the sun were focussed on 



