PROTECTION OF GllEEX LEAVES AGAINST A'lTArKS OF ANIMALS. 



449 



sketched in the case of the Barberry. As long as the young tender foliage-leaves 

 remain in this situation between the two spiny stipules (tig. 118*) they are avoided 

 by animals; the protection is only at an end when they have grown beyond the 

 points of the old spiny stipules. 



Most of the last-described protective contrivances only defend the green foliage 



Fig. 118.— Weapons of Pl.ints. 



* Branch of the Tragacnnth buah (AatTagatus TragacanUia) in spring. 2 a single le.if of this Tragacanth from which the three 

 upper leatlets have fallen. ' Leaf-axis from which all the leaflets have fallen. * Portion of a shoot of Robinia PaeudacaciOr 

 In spring. » The spiny Cytisus (CytU\u spinosiLt). *, 7 Portions of branches of the Barberry {Berberii vulgaris) in spring. 

 " Vella fpinona ; the end of last yc;ir's shoot is dried np ; this year's shoot bears flowers. 



whilst it is young. But this is exactly the time when protection is most needed. 

 If, later on, isolated foliage-leaves, which have grown beyond the points of the 

 prickles, are eaten, this does not so much matter, as part of the foliage still certainly 

 remains, and this is really the important point. 



From the fact that the protection of the young gi-een leaves is secured by 



Vol. L 29 



