PHOTOSYNTHESIS: GENERAL 29 



carbon, how many tons of hard coal must be burned to replace the carbon 

 dioxide removed from the air? 



8. If a growing corn season is 100 days, a village of how many inhabitants 

 will replace by their respiration the carbon dioxide removed from the air 

 by a field of ten acres? Use the respiration data in the text. 



9. How many tons of wood are in the oak tree mentioned on page 26? 



10. How many liters of air are required to provide the carbon dioxide for 

 a gram of sugar? 



11. Explain how the equilibrium is maintained between the C0 2 of the air 

 and the carbonates of the ocean. 



REFERENCES 



Bade, E. — Bringing the Carboniferous period into the greenhouse. Sci. Am., 



131:246, 1924. 

 Bose, J. C. — Carbon assimilation by plants. Scientia, 40:143, 1926. 

 Osterhout, W. J. V. — A demonstration of photosynthesis. Am. J. Bot., 



5:105, 1918. 

 Owen, O., Small, T., and Williams, P. H — Carbon dioxide in relation to 



glass house crops. Ann. Appl. Biol., 13:560, 1926. 

 Stiles, W. — Carbon assimilation. Sci. Prog., 18:27, 1923. 



