142 LIVING PLANTS 



ski in 1873.) The results of the foregoing 

 discussion may be briefl3^ summarized in the 

 following paragraphs. 



The relation of the growth of leaves to their 

 Conclusions food-formiiig power, is such that some are 

 able to carry development no further than 

 the beginning of the unfolding stage of the 

 laminae ; others are able to carry the develop- 

 ment to an approximately normal stature; 

 and others are capable not only of the devel- 

 opment to normal stature but also of con- 

 tinued maintenance under conditions of en- 

 forced inactivity. 



This varying reaction of leaves is dependent 

 upon a series of conditions which may be in- 

 cluded in the phrase "availability of the food 

 supply." 



The deterioration of certain leaves under 

 conditions of forced inactivity is due to insuf- 

 ficient nutrition and is accompanied by the 

 disintegration of the chlorophyll. 



The behavior of inactive leaves in light ex- 

 hibits no similarities or correspondence, in 

 simple growth or upon the intervention of 

 correlation processes, to their behavior in 

 darkness. 



Material constructed in active chlorophyll 

 areas and stored in special organs may be 

 transported to inactive chlorophyll-bearing 

 organs in some plants in light and in dark- 



