1903.] with especial Reference to its Nitrogenous Metabolism. 469 



Table IV. — Showing the Assimilation of Ammoniacal Nitrogen in 

 Preference to Oxidised Nitrogen, and the Formation of Albuminoid 

 Ammonia. 



Culture in Sterilised Sewage. Started October 31, 1901. 



No. of analysis. 



Date of 

 analysis. 





Control. 



Pure culture 

 of Chlorella 

 pyrenoidosa. 



Per cent, 

 nitrogen. 



Per cent, 

 nitrogen. 



1 



31.10.1901 



Free ammonia 

 Albuminoid 

 ammonia 



-00247 

 - -00041 





2 



20.10.1901 



and 

 21.10.1901 



Free ammonia 

 Albuminoid 

 ammonia 



-00231 

 -00072 



0-00237 

 -00059 



3 



20.12.1902 

 21.12.1902 



and 

 22.12.1902 



Free ammonia 

 Albuminoid 



ammonia 

 Nitrites 



Nitrites and 



nitrates 

 Total nitrogen 

 (by addition) 



0-00276 

 -00063 



Small reaction 



-00128 



-00467 



-00082 

 -00230 



Small reaction, 

 but greater. 

 -00131 



-00443 



