86 



JoiK.vAL OF Tin-: ^Mitchell Society 



September 



Analysis of the white corn, Silver King, grown in West Virginia. 



Percentage of 

 NitroKen 

 (2 gram sample) 



No. 1 1.418 



No. 2 1.365 

 No. 3 1.376 



Percentage of 



Nitrogen 

 (:t gram sample) 



No. 4 1.371 



Mean, 1.383% N^ 



Percentage of 

 Protein 



8.534 



Analysis of the white corn, Silver King, grown in North Carolina. 



PiTcentage of Ptncntage of Percentage of 



Nitrogen Nitrogen Protein 



(2 gram sum- le) (3 gram samiile) 



No. 

 No. 

 No. 



1.251 

 1.247 

 1.213 



No. 4 



No. 5 



1.233 

 1.217 



7.700 



Mean, 1.232% N, 



Analysis of the white corn, White Plume, seed raised and grown in North 

 Carolina. 



P rcpntMse nf 



Nitrogen 



(3 gram sample) 



No. 1 1.543 



No. 2 1.531 



No. 3 1.543 



Percentage of 

 Nitrogen 



Mean, 1.539% N, 



Percentage of 

 Protein 



9.619% 



Analysis of the yellow corn. Golden Dent, seed raised and grown in North 

 Carolina. 



Percentage of 



Nitrogen 

 (3 gram sample) 



No. 1 1.095 



No. 2 1.028 

 No. 3 1.087 



Percentage of 

 Nitrogen 



Mean, 1.070% N, 



Percentage of 

 Protein 



6.687% 



It may be of intere.st to some to know the method of nitrogen 

 determination employed. After experimenting with several modi- 

 fications of the Kjeldahl, inchiding the use of potassium perchlorate, 

 we finally adopted as the most satisfactory method of determining 

 nitrogen in corn the following: 3 grams corn, finely gronnd, is in- 

 troduced into a Kjoldahl flask. 0.3 gram copper sidphate, C. P. added, 

 and then 20 cc. sulphuric acid with phosphorous pentoxide. After 

 digesting till the material in the fla.sk has assumed a liquid form, 

 10 grams pota.ssium sulphate. C. P. is added slowly. By this plan 

 samples were completely digested and ready for distillation in times 

 ranging from 26 to 40 minutes. This included five minutes for 



