tlie unmanafactured material must be carried to the leaves and after 

 "beixig clian,t;ed, must "be taken to the flower. 



5. Storage . Perennial plants show storage to the best advantaire. 

 llagnay is an extreme example. Proteids are stored up in seeds, 

 and carbohydrates in almost all parts of the plant. Storage of 

 water is greatest in succulent plants and very common in all plants, 

 especially those which grow in the desert, 



6. Digestion is hardly important to be classed under a distinct 

 head since it is confined to carnivorous plants. 



7. Respiration is one sort of oxidation. The external manifesta- 

 tion is just the reverse of protosyntax. The latter throws off 



while respiration gives off COj, . 



8. Transpiration or the giving off K^O, is of great importance ; 

 it is evaporation and is modified by the plant. Warming attribiites 

 most things to it. It was formerly supposed that all the water 



was raised by the roots, but this view is thought now to be incorrect. 



9. Secretion and Excretion . By excretion is given off in 

 photosyntax, H^O by transpiration. All secretions and excretiors 

 are not necessarily given off thlrough glands. 



Plants have organs of secretion less fully developed than animals, 

 yet their organs meet their needs since plants take in less unnecessary 

 materials than animals, and consequently have less waste. 



Examples of excretion are tannin, resins, grams and oils. Its 

 function determines the natvire of a gland. A secretion is a 

 product which has some use in the plant organism. Some secretions 



