I04 Plants and their Ways in South Africa 



Plants that work in winter must be suitably clothed for 

 their v;ork. Even when no rain falls, the Silver Trees on Table 



Mountain are frequently 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 CO2 is 



