264 



The curves plotted from these data are shown in figs. 3-8. Along with the 

 transpiration curve are given those of the various climatic factors. Various 

 scales were employed in order that the curves all might be brought within the 

 same figure. The absolute values are given for each point. 



From an examination of these curves it becomes evident that one can place 

 the plants, according to the results obtained, under three separate groups. 



The first group contains only Casuarina lepidophloia, which is distinguished 

 from the other plants by its relatively high transpiration rate and also by its very 

 close approximation during the day to the curve for evaporating power. 



. poon l|i.M. 2 3 



/O // 'i rr]i'Jr)i^ht 



Fig. 3. 



Curve for rate of transpiration of Casuarina lepidophloia. 

 T, Temperature ; E, Evaporating Power ; L, Light Intensity. 



In the second group are Geijera parviflora and PhoUdia scoparia. The trans- 

 piration rate of both these plants is low, and although they attain their transpira- 

 tion maxima coincidently with the maximum value for the evaporating power, 

 it is evident from their lack of agreement with the latter curve that they do not 

 respond so readily to slight variations in the evaporating power of the air. Both 

 plants also exhibited a second maximum at 8-9 o'clock in the night. 



