THE AMERICAN 



MONTHLY 



MICROSCOPICAL JOURNAL. 



VOL. XX. , i^PRIL, 1899. ' NO. 4. 



CONTENTS. 



Seven New Species of Diatom, Boyer 105-108 



Malaria Parasites at Camp Wikoff, Ewing 108 109 



Artificial Culture of Diatoms, Terry no-114 



To Ascertain Focal Length. Nelson 114-116 



Another Way to get Focal Length, J. G. P. V -116 ity 



Focal Length, Cross 1 17-120 



Staining Cover-Glass Preparations, Moore 120-124 



Staining the Flagella of Bacteria, Loffler 124-125 



Letters TO The Editor.— Gates' Double Microscope 125-126 



EdiToriai^.— Stains, Diagnosis, Terms 126 



Microscopical Apparatus.— Quekett Club 127 



Microscopical Manipulation— Varnishes, Gelatin Culture 



Media, Double Staining Micro-organisms 127-129 



Biological Notes. — Chalk, Spindle Formation in Anthers 129-132 



Diatoms —Slides 132-133 



Bacteriology. — Whooping Cough, Influenza Bacillus, Seeds 



of Bacteria I33-I35 



Medical Microscopy. — Alcohol, Faulty Rum 135-136 



Drug and Food Adultkr.\tion.— Study of Drugs 136 



Microscopical Societies. — Royal ' 136-137 



New Publications. — Microscope, Coccospheres and Rhabdo- 



spheres, Atlas of Bacteriology, 137-138 



Miscellaneous. — List ot Second-Hand Books for Sale 138-140 



Seven New Species of Diatoms. 



CHARLES S. BOYER. 

 WITH FRONTISPIECE. 



Rhabdonema woolmanianum.— Valve oblong, with 

 sharply crenuhite margin, punctate, the puncta in trans- 

 verse rows, about 6 in 01 mm, Pseudoraphe indistinct. 

 Septa perforate, connected with each other usually near 

 alternate ends by straight transverse diaphragms. Length 

 of valve, .155 mm, to .231 mm. Fossil in the Miocene 

 deposit from an artesian well at Asbury Park, N. J., at 

 a depth of 40 ft. Not uncommon. Approaches R. harnu- 

 liferum Kitten and R. musica Brun., but it does not show 

 either hooked septa as in the former nor curves resem- 

 bling musical notes as in the latter. It also differs in the 

 character of the margin and in size, being four or five 



