472 



DAVID D. WHITNEY 



while experiment 5 shows the amount of oxygen generated by 

 varying quantities of Chlamydomonas during a five-hour period. 

 It may be readily seen in the last columns of the table that the 

 amount of free oxygen is greatly increased in the sunlight. 



TABLE 2 



Shoiving that old culture water free from decomposing materials and cordaining 



only a small quantity of free oxygen gradually abso7-bs additional free 



oxygen from the surrounding air 



TIME, 1918 



4 P.M., Nov. 9 

 4 P.M., Nov. 9 



4 P.M., Nov. 7 

 4:15 P.M., Nov. ' 



5 P.M., Nov. 8 



4 P.M., Nov. 9 

 11 A.M., Nov. 10 



5 P.M., Nov. 11 



9 A.M., Dec. 17 

 10 A.M., Dec. 18 

 10 A.M., Dec. 19 



9 A.M., Dec. 20 



3 P.M., Dec. 23 

 3 P.M., Dec. 24 

 3 P.M., Dec. 25 

 3 P.M., Dec. 26 



3 P.M., Dec. 25 

 3 P.M., Dec. 26 

 3 P.M., Dec. 27 

 3 P.M., Dec. 28 

 3 P.M., Dec. 29 



Ta]i-water 

 Tank rain-water 



Old culture water 

 Old culture water 

 Old culture water 

 Old culture water 

 Old culture water 

 Old culture water 



Old culture water 

 Old culture water 

 Old culture water 

 Old culture water 



Old culture water 

 Old culture water 

 Old culture water 

 Old culture water 



Old culture water 

 Old culture water 

 Old culture water 

 Old culture water 

 Old culture water 



Unfiltered 



Filtered 



Filtered 



Filtered 



Filtered 



Filtered 



Unfiltered 

 Filtered 

 Filtered 

 Filtered 



Filtered 

 Filtered 

 Filtered 

 Filtered 



Filtered 

 Filtered 

 Filtered 

 Filtered 

 Filtered 



