4 CIECULAR NO. Ill, BUREAU OF PLANT INDUSTRY. 



Table I. — Composition of cornstalks grown and analyzed at Garden City, Kans. 1 



Date of 

 analysis. 



Field treatment. 



Solids. 



Differ- 

 ence. 



Sucrose, 

 direct 



polariza- 

 tion. 



Differ- 

 ence. 



Appar- 

 ent 

 purity. 



Differ- 

 ence. 



/Ears removed 



\Ears not removed. 



/Ears removed 



(Ears not removed . 



fEars removed 



\Ears not removed. 



Ears removed 



/Ears removed 



(Ears not removed. 



/Ears removed 



\Ears not removed. 



(Ears removed 



\Ears not removed . 



Per cent. 

 15. 45 

 11.70 



15.80 

 8.90 



16.80 

 11.55 



16.60 



16.25 

 10.95 



16.17 

 13.22 



17.54 

 12.87 



Per cent. 

 | 3.75 



}■ 6.90 



!■ 5.25 



Per cent. 



9.76 

 5.77 



5.30 



2.95 



4.67 



Average increase following removal 

 of ears 



4.80 



3.65 



11.33 



5.96 



10.85 



10.65 

 4.60 



10.03 



7.41 



s 10. 50 

 2 6.50 



Per cent. 

 \ 3.99 



\ 6.33 



\ 5.37 



Per cent. 

 63.20 

 49. 30 



/ 63.20 \ 

 \ 49.30 J 



Per cent. 

 13.90 



63.20 

 41.00 



/ 67.40 \ 

 \ 51.60 / 



22. 20 



15.80 



| 6.05 

 | 2.62 

 } 4. 00 



65.40 



65.60 

 42.00 



62.00 

 56.15 



2 59. 86 

 2 50. 50 



4.73 



23. 60 



5.85 



9.36 



15.12 



1 Analyses made at the Garden City Field Laboratory of the Office of Sugar-Plant Investigations. 



2 These results are from Hauser's analyses; they seem to have been calculated from Clerget polarizations, 

 in which case the values for sucrose and purity would be true instead of apparent, which would make both 

 sets of figures higher, relatively, than those of the preceding analyses. 



The data presented in Table I show that throughout the entire 

 period covered by the analytical work there was a marked increase 

 in the solids, in sucrose, and in purity as a result of removing the 

 ears, the average increase in each case being 4.80, 4.73, and 15.12 per 

 cent, respectively. In no instance was there a decrease. It will be 

 seen that in the stalks from which the ears had been removed there 

 was an increase in the percentage of sugar from the first analysis 

 until September 5, when the maximum was reached. After this 

 there was a small, though fairly uniform, decrease until September 25, 

 when there was a slight increase. 



EXPERIMENTS AT WASHINGTON. 

 FIELD DATA. 



For the experiments at Washington, D. C, a dent corn was used, 

 which was a selection of the Boone County White. It was planted 

 about May 30 and the ears were removed on August 22. The follow- 

 ing data were obtained regarding the weight of ears and the cost of 

 removing the same: 



Weight of ears from one-third acre 2, 754 pounds. 



Time required to remove ears from one-third acre 5 hours. 



Time required to pick up ears and carry them from field 3 hours. 



Total cost of removal of ears from one-third acre (8 hours, at 

 15 cents) $1. 20. 



ANALYTICAL METHODS AND RESULTS. 



Analyses of the stalks from which the ears had been removed, as 

 well as from those on which the ears remained, were made on Tuesday 

 and Thursday of each week from August 27 to October 29. The 



