Kll 



I'l.A.NT STUDIES 



TJiis iissociution of insects ;iml flowers is soiiietiiiK'S so 

 intimate that tliey have come to de2)eiid ahsolutely upon 

 one anotlier. I'ls^iecially among the oi'eliids is it true tliat 

 sjieeial llowers and insects are adajited so exactly to one 



another, that if one dis- 

 appears the other he- 

 comes extinct also. 



1 'i2. " Carnivorous " 



plants. — This name has 



heeii given to plants 



/, /Li III which have developed 



/, AW , Jni -j-jj^-, (^^^]-i|^,;is hahit of 



capturing insects and 

 using them for food, 

 and perha})s they had 

 better he called " insec- 

 tivorous jjlaiits."' They 

 are green plants and, 

 therefore, can manu- 

 f at' t Lire carhohydra.tes. 

 Bui they live in soil 

 2)oor in nitrogen com- 

 pouiuls, and hence pro- 

 teid formation is inter- 

 fered witli. The bodies 

 of ca|>tured insects sup- 

 plement the proteid 

 supply, and tlu' ])bints 

 have come to depend 

 upon them, ^fany, if 

 not all, of these car- 

 nivorous plants secrete 

 a digestive sul)stance 

 which acts upon the 

 bo<lies of the ca|iinred insects vcit much as the diges- 

 tive substances of the alimentary cana.l act \\\wn proteids 



