THE AMERICAN 



MONTHLY 



MICROSCOPICAL JOURNAL, 



VOL, XX, M^RCM, 1899, NO, 3, 



CONTENTS. 



Life History of a Parasitic Fungus 69-75 



Practical Hints on Mounting, Mason 75-8i 



Bacillus Tuberculosis Stained by Sudan III, Dorset 81-84 



Nobert's Bands, Micrometer Rulings, James 85 87 



Artificial Culture of Diatoms, Terry 87-95 



LETTERS to the Editor. — Gates' Double Microscope, Slides 96 



Editorial.— Experiment, Indian Corundum, White's Objects.. 96-97 

 Microscopical Apparatus. — Lantern Microscope, Green- 



ough's Instrument, Objective, Pointer, Color Effects 97"99 



Microscopical Manipulation. — Spirit- Proof Micro-Cement, 

 Focal Lengths, New Stain, To Kill Invertebrates, To Mount 



Ameba 99-101 



Biological Notes. — New Alga, Jerusalem Mud, Ameba 101 



Bacteriology. — Are Bacteria Fungi? 101-102 



Microscopical Societies. — Royal 102-103 



New Publications. — Histology of the Eye, Moore's Bacteri- 

 ology, Swiss Rotifers, Photo-Micrography. .„ 103-104 



Miscellaneous. — Personal, Necrology, Fossil Plants, Objects, 



Marine Specimens, Instruments 104 



The Life-History of a Parasitic Fungus. 



[Compiled from Quecket Club Journal.] 



1 



WITH FRONTISPIECE. 



One of the strangest facts in plant life that has been 

 worked ont by the botanists daring the past 100 years is 

 the following. There are plants called fungi which not 

 only live parasitic upon other plants but require two or 

 more species as hosts. This fact was not settled scientific- 

 ally until 1816 when a Danish schoolmaster rubbed the 

 underside of a barberry leaf infected with secidia onto 

 some plants in a field of rye. The rye plants were then 

 marked. In a few days, the fungus had spread itself 

 widely over the plants in question while all the others 

 were free from infection. In 1760, the farmers of Mas- 

 sachusetts had felt so sure of a connection between wheat 

 mildew (Puccinia graminis), and barberry bushes that 



