116 



IOWA ACADEMY OP SCIENCES. 



WATER FREE SUBSTANCE. 



Sample 1. 

 Sample 2. 

 Sample 3. 

 Sample 4. 

 Sample 5. 

 Sample B. 

 Sample 7 



33.26 

 37.03 

 30.94 

 40.60 

 45.47 

 49.86 

 50.15 



In the above results we find that the amount of water pres- 

 ent varies from 84.82 per cent to 58.77 per cent, while it might 

 be said that the amount tends to become less as the plant 

 matures, yet there are exceptions, as it will be seen that the 

 first sample collected in April having a height of four to 

 twelve inches has only 2.84 per cent more of water than the 

 sample taken on July 20th and having a height of forty-eight 

 to forty-nine inches. 



In considering the water free substance we find that the fat 

 present varies from 5.81 per cent to 2.95 per cent, and that the 

 change is not a constant one. The change in the amount of 

 protein is constant for the first six samples and changes from 

 23.16 per cent to 7.81 per cent and ia the seventh sample hav- 

 ing this substance to the amount of 8.26 per cent; however, 

 in the results for albuminoids we find that the decrease of this 

 substance is constant, changing from 17.99 per cent to 6.11 

 percent. The amount of fiber varies irregularly from 24.36 

 per cent in the youngest sample to 37.72 per cent in the third 

 sample of May 28th. The ash constituent decreases with a 

 regular change, while tha nitrogen free extract inoreases con- 

 stantly with one exception from 33.26 per cant to 50.15 per 

 cent, the exception being the third sample wit a 30.94 per 

 cent. The following analyses are added for comparison: 



AIR DRY SUBSTANCE. 



WATER FREE SUBSTANCE. 



South Dakota Ool. Saptember 1, 1892 1 10.43 I 2. 



Tennessee not yet in bloom I 7.87 12. 



30.17 I 14.08 

 33 14 I 8.96 



42.64 

 47.44 



9.06 



• S. D. Bull. Agricultural Experiment Station 40, p. 64. 



+ Bull. Tenn. Agricultural Experiment Station, Vol. IX. No. 3, p. 



$ Hay of grass. 



