COMPOSITION' IN SUCCESSrVB STAGES. S07 



On dividing the above quantities by the number of days 

 of the respective jDeriods, there results : 



The Average Daily Gain or Loss per Acre during 

 each Period. 



Table IV.— Br, 

 Diij Hatter. Water, 



1st Period, 23 lbs. Gain. 87 lbs. Gain. 



3d " 163 " " 383 " "' 



4tli " 65 " " 167 " Loss. 



5tli " 113 " . " 447 ". " 



4. — Table III, and especially Tab. IV, show that the gain 

 of organic matter in Bretschneider's oat-crop went on 

 most rapidly at or before the time of blossom, (according 

 to Arendt at the time of heading out.) This was, then, the 

 period of most active growth. Afterward the rate of 

 growth diminished by more than one-half^ and at a later 

 period increased again, though not to the maximum. 



Absolute Quantities of Carbon, Hydrogen, Oxygen, 

 IVitrogen, and Ash, in the dry oat crop at the conclusion of 

 the several periods ; {lbs. per acre.) 



Table V.— Br. 

 Carbon. Hydrogen. 

 1st Period, . 593 80 



3d " 3,137 386 



4tli " 2,600 343 



5tk " 3,339 405 



Relative Quantities of Garbon, Hydrogen, Oxygen, 



IVitrogen, (Organic Matter,) and Ash in the dry oat crop, 



at the end of the several Periods ; {per cent.) 



Table VI.— Br. 



Carion. Bydrogen. Oxygen. Nitrogen. {Organic Jlatt^r^ Ash. 



6.23 35.39 3..59 91.43 8.57 



6.53 35.96 3.79 94.04 5.96 



6.33 37.65 3.78 94.67 5.33 



5.88 39.40 3.43 94.60 5.40 



* In Bretschneider's analyses, "ash" signifles the residue left after carefally 

 burning the plant. In Arendt's InveBligation the sulphur and chlorine were de- 

 termined in the unburned plant, 



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