DEFENCE. I I 3 



the plant louse {^Parlatoria zizyphi) which latter is a 

 parasite of Citrus trees is by no means uncommon. 

 When examining a plant in the field a botanist is very 

 apt to forget these multifarious enemies and complex 

 dangers, and thereby misses the plain meaning of many 

 details of its structure. 



(B7) H 



