A PHYSIOLOGICAL CHART 



261 



6. Any accumulated food which had not boon usod during the life of the plant or 

 any by-products produced would be released, after death, by the decay of the cell 

 walls. 



7. The "oxidation" of carbohydrates and the release of energy by the process of 

 respiration has been questioned. References and a discussion of this subject may 

 be found in the following: Armstrong, E. Frankland. The simple carbohydrates 

 and the glucosides. 2d ed. pp. 12.5-131, 167-168, 1912. Barnes, C. R. The theory 

 of respiration. Bot. Gaz. 39 : 81-98, 1905. Also in Science n. s. 21: 241-2.52, 190.5. 

 Barnes, C. R. Physiology (in Coulter, Barnes, and Cowles, Textbook of Botany, 

 Part II), pp. 401 and 403, 1910. 



8. '' Fe as a catalyst (?)" refers to the formation of chlorophyll, although it does 

 not enter into chemical combination. On the other hand Mg has been shown to be 

 a constituent part of chlorophyll. 



9. Water of transpiration. This is much more in amount than the water used in 

 the photosynthetic process. 



10. Assimilation. More correctly two steps should be recognized here, first, a 

 decomposition of the plant foods (carbohydrates, fats, amides, and proteins are the 

 most important) due to the hydrolytic enzymes; and second, the synthesis of the 

 specific cell protein compounds into protoplasm, likewise due to enzymes. 



11. Enzymes. Since most chemical changes connected with the protoplasm 

 depend upon enzymes, and since every living cell in the plant contains enzymes 

 which are probably connected with every synthetic and digestive process it would 

 complicate the chart too much to show all these relations. This has not been 

 attempted further than to indicate the more important synthetic relations and the 

 digestive role preceding food transfer. 



