COMPOSITION OF PLANTS 49 



bark of most plants. Besides the carboh yd rates, fat or 

 oil is found in plants, principally in the seeds: for in- 

 stance, the castor-oil bean and cottonseed 



/ ripj /.■/!// \ / 



Cut tOMi /">/< ijkiss; ,i,ii/h it and dr\j it in the 8UH. After 



■ >i ntujh Hymn anil no/ice kou much it hn.s lust iti weight. 



■ t it ON firr and alluu tt In bum; uiiyh the ash. i 

 lute tki "f both moistun and ash 



Questions 



1. ll.»\v is hay formed? 2. Why docs hay weigh less than 



: us from which it was cut? 3. What happens to hay 



when heated i>y tin? 4 Wales eontains the more BMisturs, ■ 



plant Of its seed? 5. \N hen BOtetmc Ml dried out from ■ plant, 

 what i^ tin- remainder called': •'». H-.\v i> dry nsSffST made BBl 

 7. That part id a plant which disappears wImii the plant is 

 bvmed is called what? S. Into what two classes of substances 

 c;in organic matter Im- divided? 9. Of what live elements is the 

 nitrogenous matter of plants made up? 10. What ate these 

 five elements called? 11. In what parts of the p'ant is protein 

 usually found? 18. (Jive an example of a nitrogenous sub- 

 stance. 13. What are the best known non-riitrogenous sub- 

 stances found in plants? 14. What three elements make up 

 carbohydrates ? 



PROBLEMS 



1 . If n certain hay contains 10 per cent of water, how many 

 p. unds of dry matter d«M*s a ton of such hay contain? 



.. .• hundred pounds of corn contains 350 pounds of 

 starch, what is the per cent of starch? 



! i\e hundred pounds of oats contains 50 pounds of pro- 

 calculate the per cent of protein. 



