214 



G. ORSHAN 



Between lOO and 150 plants belonging to each species, as equal as possible 

 in size, were selected in their natural habitats and marked when the 

 measurements were started. A sample of 5 plants was randomly removed 

 from the plot every month. All the green parts, whether they were leaves , 



IV V VI 

 1958 



Fig. 5. Annual march of dry weight (grams) of the transpiring body of Mediterranean 



plants. 

 C.s. - Cistus sabifolius Th.c. - Thymus capitatus 



"P. sp. - Poteriu m spinosum T.p.-Teucrium polium 



Stems or both, were^oUected from each plant separately and their dry 

 weight determined in the laboratory. 



The annual march of the dry weight of the transpiring body is presented 

 in Figs. 4 and 5. From these figures, it is evident that all the plants examined 

 markedly reduce their transpiring body during the summer. The maximum 



