104 Plants and their JVars in South \ Africa 



Plants that work in winter must be suitably clothed for 

 their work. Even when no rain falls, the Silver Trees on Table 



Mountain are frecjuently enfolded by the fringes of the "Table 

 cloth ". We have seen that a great amount of water passes off 

 in the form of vapour. Vapour cannot pass off if the leaves 

 are water soaked and the exchange of gases, O and CO,_> is 



