GRASSES OF IOWA. 



395 



Sample 1. Collected May 8, 1896, 5 to 9 inches high. 



Sample 2. Collected May 26, 1896, 14 to 15 inches high. 



Sample 3 Collected June 5, 1896, 14 to 15 inches high. 



Sample 4. Collected June 17, 1896, 23 to 24 inches high. 



NATURAL CONDITION. 



Sample 1. 

 Sample 2. 

 Sample 3. 

 Sample 4. 



0) 



c3 



bo 

 o *= 



8 80 

 10.01 

 12 58 

 14 40 



WATER FREE SUBSTANCE. 



Sample 1. 

 Sample 2. 

 Sample 3 

 Sample 4. 



46.80 

 42.08 

 43 99 



43 08 



The amount of water present decreases from 81.20 per cent 

 to 66.57 per cent, and the fat present in the water free sub- 

 stance varies from 2.87 per cent to 3.76 per cent, the last sam- 

 ple having the largest percentage. The amount of protein pres- 

 ent varies from 8.16 per cent to 12.09 per cent, the albuminoids 

 from 5.14 per cent to 10.32 per cent, and both are irregular in 

 the changes. The fiber changes from 27.47 percent to 33.28 

 per cent, the ash from 9.21 per cent to 11 61 percent, and these 

 are also irregular in their changes. The largest amount of 

 nitrogen free extract is present in the first sample, having 46.80 

 per cent, and the smallest amount in the second sample of 42.08 

 per cent. It would appear from the chemical analyses that 

 the time most suitable for harvesting was when the last sample 

 was taken and the grass 23 to 24 inches high. 



The following analyses from other sources are added for 

 comparison: 



AIR-DRY SUBSTANCE. 



