THE AMERICAN 



MONTHLY 



MICROSCOPICAL JOURNAL 



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



VOL, XX, JUNE, 1899, NO, 6, 



CONTENTS. 



The Powdery Mildews 171 174 



Action of Twenty Per Cent Watery Solutions of Aclohol on 



Brain Tissues, Cutter 174-176 



Preparing.Cutting, Staining, and Mounting Sections of Botan- 

 ical Tissues, Cole 176-181 



Notes on Microscopy, Cooke 1S1-185 



General Characters of the Fungi, Massee 185-19C 



On the Structure of the Nodules in Pleurosigma, Nelson 190-196 



Editorial. — A Field of Labor, Earth Wanted 196-197 



Microscopical Apparatus. — Nose-piece, Fixing, Hardening 



Apparatus, Critical Illumination, Microtome-knife, Light ... 197-198 

 Microscopical Manipulation. — Red Stain, Preservative, Ex- 

 amination of Steel. 198 



Biological Notes. — Marine Station at Wood's Holl 198-199 



Bacteriology. — Examination of Water Supply 199 



Diatoms. — The Marking on Diatoms 200 



New Publications. — Prang's Standard of Color 200 



The Powdery Mildews. 



[FRONTISPIECE LOANED RY ASA GRAY BULLETIN.] 



Following the plea for the study of micro-fungi in our 

 last number appropriately comes this beautiful plate 

 which was drawn by David Griffiths to illustrate his ar- 

 ticle in the Bulletin and which editor T. A. Williams has 

 kindly loaned. As very few of our readers see the Bulle- 

 tin which is now in its seventh volume, (published bi- 

 monthly at fifty cents a year at Takoma Park, D. C.) the 

 illustration will have all the value of an original contri- 

 bution. 



