THE AMERICAN 



MONTHLY 



MICROSCOPICAL JOURNAL 



Vol. XIII. 



JUNE, 1892. 



No. 6. 



CONTENTS. 



On the Continuity of Protoplasm 

 through the Cell Walls of 

 Plants (Illustrated).— Beal 

 and TouMKY 129 



Impressions of the Antwerp Mi- 

 croscopical Exposition. -Ward 133 



An Interesting Study of Living 

 Micro Organisms. — Gibbes - 141 



Radiolaria : Their Life-History 

 and Their Classification. — 

 Carter 143 



Editorial. — Proceedings of the 

 American Society of Micros- 

 copists - 145 



Microscopical Manipulation. 

 — Poisoning Protoplasm with 

 Qiiinine. To Prepare Lignite. 

 Transparent Cement. Using 

 Oil-immersion Objectives. 

 Preparing Sponges - - - - 146 



Biological Notes. — Teaching 



with the Microscope. Weed 

 Extermination. Effects of 

 Electrocution. How Sealskin 

 is Prepared ------- 147 



Diatoms. — What arc Diatoms.? 

 Cleaned Material - - - - - 14S 



Medical Microscopy. — Micros- 

 copy for the Druggist. The 

 Clinical College of Medicine 

 and Specialty Hospital. 

 Sweating. Pasteur Institute. 



Microscopical News. — A Silver 

 Medal for Dr. Taylor. An 

 Electric Microscope. E. H. 

 Griffith. Bausch & Lomb's 

 New Buildings 



Correspondence - - . - - 



Microscopical Societies. — 

 Washington. San Francisco. 

 St. Louis 151 



Notices of Books. — Gould. 152 



49 



150 

 151 



On the Continuity of Protoplasm through the Cell Walls of 

 Plants. 



By W. J. BEAL and J. W. TOUMEY. 



AGRICULTURAL COLLEGE, MICH. 



Sachs, in 1S63, proved the continuity of protoplasm from cell 

 to cell through sieve plates, and in 1880 made the remarkable 

 statement that this continuity was universal in plants. He said, 

 " Every plant, however highly organized, is fundamentally a pro- 

 toplasmic body forming a coimected whole, which, as it gi'ows 

 on, is eternallv clothed by a cell membrane, and internally tra- 

 versed by innumerable transverse and longitudinal walls."* 

 Considering the difficulty of successfully demonstrating the con- 

 tinuity of protoplasm in many parts of plants, more especially 



*Walter Gardiner, in Philosophical Transactions of ihe Jipyal ^ciety of London, Vol. 17^. 



