94 



The Ohio Journal of Science [Vol. XXI, No. 3, 



was not analysed. It disappears by the middle of February, 

 at which time the total carbohydrate material increases slightly. 

 A marked decrease of carbohydrate occurs during the growing 

 period of April, May and June. 



4. The starch content of roots and stems increases rapidly 

 with the decrease of growth in autumn, following a course 



fifay Tunt, July /^uy. "S?/.. O^t: /V,v. 2)£c. Jan. Pti>. /lor- A/>r. 



H f^"- y 



Zcl\r 



Fig. 4. Curves showing the changes in carbohydrates in two-year-old seed- 

 lings of apple from June to April, 1919-1920. The ordinates represents the per- 

 centage of carbohydrates and the abscissae, the season of the year. 



parallel to that of total carbohydrate in each case. The 

 increase of starch in roots is much greater than that in stems. 

 In one- and two-year-old stems the maximum is reached in 

 October and November, followed by a gradual decrease, while 

 in the case of roots the maximum accumulation of starch occurs 

 in, December, after which there is a rapid fall. The minimum 



