Section 2. 



PHYSIOLOGY OF THE ORGANS OF KTTEITION OK TEGE 

 TATION 



1. Of the Root or Descending Axis 



Absorption by the Root . 

 Excretion by Roots . 



2. Of the Stem or Ascending Axis 



Special Functions of the different Parts of the Stem 



1. The Pith 



2. The Wood 



3. The Medullary Rays 



4. The Bark 



3. Of the Leaves 



1. Exhalation of "Watery Vapour by Leaves . 



2. Absorption of Fluids by Leaves . 



3. Absorption and Exhalation of Gases by Leaves 



4. Formation of Organic Products and Secretions by 



Leaves 



5. Effects of Gases generally upon Leaves 



Wardian Cases .... 



6. Colour of Leaves .... 



7. Defoliation, or the Fall of the Leaf 



8. Development of Leaves 



Section 3. 



PHYSIOLOGY OF THE OEGAXS OF BEPRODUCTION 



1. Functions of Bracts and Floral Envelopes , 



Development of the Floral Envelopes 



2. Of the Essential Organs of Reproduction 



Sexuality of Plants 



1. Reproduction of Cryptogamous or Acotyledo 



nous Plants 



A. Reproduction of Thallogens 

 Fungi and Lichens 

 Algae . _ 



1. Conjugation .... 



2. Impregnation of naked spores or 



germ corpuscles by ciliated sper 

 matozoids 

 B. Reproduction of Acrogens 



1. Characese .... 



2. Hepaticacoge 



3. Musci .... 



