468 Miss H. Chick. On a Unicellular Green Alga, [Feb. 28, 



Table III. — Showing the Assimilation of Ammoniacal Nitrogen in 

 Preference to Oxidised Nitrogen, and Formation of Albuminoid 

 Ammonia. 



Culture in Sterilised Sewage, which had stood for some time. Started 

 November 8, 1901. 



Pate of 

 analysis. 



- 



Control. 



Pure culture 

 of ChloretJa 

 'pyrtnoidosa. 



Culture of 

 Chlor. pyrenoi- 

 dosa contami- 

 nated with the 

 bacteria which 

 usually accom- 

 pany it. 







Per cent, 

 nitrogen. 



Per cent, 

 nitrogen. 



Per cent, 

 nitrogen. 



8.11.1901 



Free ammonia 

 Albuminoid 

 ammonia 



00124 

 0-00023 







18.12.1901, to 

 20.12.1901 



Free ammonia 

 Albuminoid 



ammonia 

 Nitrites 

 Nitrites and 

 nitrates 

 Total nitrogen 

 (by addition) 



-00141 

 -00025 



Small reaction. 

 -00142* 



-00308 



-00030 

 00105 



Small reaction 

 -00135f 



-00270 



'00058 

 -00097 



Small amount 

 -00119 



0-00274 



* Tree ammonia was got rid of by boiling before the addition of the ZnCu 

 couple. 



f Probably under estimated. 



