34 DISEASE IN PLANTS. 



It is hardly necessary to point out that im- 

 portant practical consequences may result from 

 these phenomena of the accumulation of surplus 

 starch or other carbohydrates in the leaves during 

 the day, and of their disappearance during the 

 night into the lower parts of the plant. For 

 instance, foliage cut for fodder in the morning 

 is far poorer in starch than if cut in the evening, 

 and it would be very instructive to have experi- 

 ments made on a large scale to test the result 

 of feeding caterpillars or rabbits, for instance, with 

 mulberry, vine, or other leaves in the two con- 

 ditions. 



Again, we now see what complications may 

 arise if a parasitic organism gains access to the 

 stores of carbohydrates in process of accumulation, 

 or attacks and injures the machinery which is 

 building up such materials, etc. 



No'JKs TO Chapter IV. 



The student who desires to pursue this subject further 

 should read Sachs' Lectures, XX. and XXV., and Pfeffer's 

 Physiology, pp. 442-566, but he will hardly arrive at the best 

 that has been done without consulting Pfeffer's " Studien zur 

 Energetik der Pflanzen " in the Abhandl. der Math.-Phys. 

 Classe der Kgl. Sachss. Gesellsch. der Wiss. (Leipzig, 1892), 

 p. 151 ; and Kassowitz, Allgeineine Biologic (Vienna, 1899), 

 Kk. L, p|j. I -127. 



