LEAVES. 33 



and fiction of the stomata, and as these vary 

 considerably in different plants, it is evident 

 that some are created to prefer shade, others to 

 prefer light. 



In this climate where the atmosphere is so 

 pure and free from mist and vapor, where solar 

 light is so intense during the summer, attention 

 to these principles is peculiarly requisite. On 

 this subject, more will be found under the con- 

 siderations of light, air, perspiration, and trans- 

 plantation. 



The usual position of leaves is spiral, at 

 regularly increasing or diminishing distances ; 

 they are then said to be alternate. 



But if the space of the stem called the axis, 

 that separates two leaves, is reduced to nothing 

 at alternate intervals, they become opposite. 



And if the spaces that separate several leaves 

 be reduced to nothing, they become verticillate 

 or whorled. 



Opposite and verticillate leaves, therefore, 

 differ from alternate leaves only in the spaces 

 that separate them being reduced to nothing. 



