THE AMERICAN 



MONTHLY V >tO^^]* ^ 



MICROSCOPICAL JOURNAL. 



Vol. XIII. 



JUNE, 1892. 



No. 6. 



CONTENTS. 



On the Continuity of Protoplasm 

 through the Cell Walls of 

 Plants (Illustrated).— Beal 

 and TouMEY ------ 



Impressions of the Antwerp Mi- 

 croscopical Exposition. -Ward 



An Interesting Study of Living 

 Micro-organisms. — Gibbes - 



Radiolaria : Their Life-History 

 and Their Classification. — 

 Carter -.- 



Editorial. — Proceedings of the 

 American Society of Micros- 

 copists -------- 



Microscopical Manipulation. 

 — Poisoning Protoplasm with 

 Qiiinine. To Prepare Lignite. 

 Transparent Cement. Using 

 Oil-immersion Objectives. 

 Preparing Sponges - - - - 



Biological Notes. — Teaching 



1-9 



m 



141 



143 

 145 



146 



with the Microscope. Weed 

 Extermination. Eflectsof 

 Electrocution. How Sealskin 

 is Prepared -------147 



Diatoms. — What are Diatoms.'' 

 Cleaned Material 14S 



Medical Microscopy. — Micros- 

 copy for the Druggist. The 

 Clinical College of Medicine 

 and Specialty' Hospital. 

 Sweating. Pasteur Institute. 149 



Microscopical News. — A Silver 

 Medal for Dr. Taylor. An 

 Electric Microscope. E. H. 

 Gritlith. Bausch & Lomb's 

 New Buildings 150 



Correspondence ----- 151 



Microscopical Societies. — 

 Washington. San Francisco. 

 St. Louis 151 



Notices of Books. — Gould. 152 



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 iSSo made the remarkable 

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

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

 toplasmic body forming a connected whole, which, as it grows 

 on, is eternally 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 the Royal Society of London, Vol. 174, 

 p. 817. 



