256 PRACTICAL BOTANY. 



The viscid secretions of the Sundew and Venus' Fly- 

 trap, as is the case with the corresponding secretion of 

 other insectivorous plants, serve not merely to catch and 

 hold the insects, but they contain digestive ferments which 

 act upon the animal matter and break it down into forms 

 that can be taken into the plant to serve as food. 



References for Reading. Goebel's " Outlines of Classification," pp. 

 445-472 ; Vines' " Text-Book of Botany," pp. 570-783 ; Scott's " Struc- 

 tural Botany," pp. 12-141; H.Marshall Ward's "The Oak"; Bower's 

 " Practical Botany." pp. 54-228 ; Strasburger and Hillhouse's " Prac- 

 tical Botany," pp. 311-372 ; Dodge's " Practical Biology," pp. 336-377 ; 

 Bidgood's " Elementary Biology," pp. 145-190 ; Huxley and Martin's 

 " Practical Biology," pp. 460-481 ; Arthur, Barnes, and Coulter's 

 " Plant Dissection," pp. 222-242 ; Bessey's " Essentials of Botany," pp. 

 251-278; Boyer's "Elementary Biology," pp. 162-166; Gray's "Struc- 

 tural Botany " ; Carpenter's " The Microscope," pp. 609-650 ; Darwin's 

 "Power of Movement in Plants "; Darwin and Acton's "Physiology 

 of Plants"; MacDougal's "Plant Physiology"; Goodale's "Physio- 

 logical Botany " ; Geddes' " Chapters in Modern Botany " ; Strasburger, 

 Noll, Schenck, and Schimper's " Lehrbuch der Botanik," pp. 131-260, 

 372-520. 



