232 STRUCTURAL BOTANY 



plants with very crowded flower-buds, enclosed in a 

 sheathing bract, a much greater rise of temperature 

 takes place in consequence of respiration. 



We have now very rapidly sketched some of the 

 chief phenomena connected with the nutrition and 

 respiration of plants. These subjects, however, form 

 only a part of the field of physiology. The whole 

 question of the growth and movements of plants still 

 remains. For this, however, more advanced text 

 books must be consulted. We have only aimed at 

 giving so much physiological information as is 

 necessary in order to understand the morphological 

 facts which it is the chief object of this book to teach. 



