The 
Plant World 
a jttaga?tne of popular TBotant 
VOLUME 8 
N U M B E R 12 
DECEMBER, 1905 
Containing 
Wilhelm Hofmeister. Professor K. Goebel.. . . 291 
Notes on the Ferns of North-central Ontario. A. B. Ki.ugh ..... 298 
A Peculiar Hygroscopic Movement in the Capsules of Kneiffia. Roland 
M. Harper. .. 301 
The Defenses of the Cock-spur Thorn : Another Interpretation. 
Willard N. Clute ..303 
The Teacher’s Department: 
Another Root Cage ................... 305 
Demonstration of Masked Chlorophyll in Frond of Laminaria . . 305 
A Simple Modification of Detmer’s Experiment ......... 306 
Reviews : 
Smith’s Bacteria in Relation to Plant Diseases ........ 307 
Duncan’s The New Knowledge ... ... ........ 307 
Freeman’s Minnesota Plant Diseases ....... . . 308 
Clute’s The Fern Allies of North America North of Mexico . 308 
Chamberlain’s Methods in Plant Histology ....... ... 309 
A Nature Study of Maryland Plants .... ........ 309 
Lancaster, Pa* & New York 
Copyright, 1905, by Francis Ernest Lloyd. 
Entered as Second-Class Matter February q, iqos, at the Post-Office, at Lancaster, Pa., under the 
Act of Congress of March 3, 187Q. 
