1903.] with especial Reference to its Nitrogenous Metabolism. 467 



Table I. — Showing Assimilation of Ammonia. 

 Culture in Solution "A." Started October 21, 1901. 



No. of analysis. 



Xylite Ul 



analysis. 



— ; 





Control. 



Culture of 



Chlorella 

 pyrenoidosa. 



Per cent, 

 nitrogen. 



Per cent, 

 nitrogen. 



1 



21.10.1901 



Free ammonia 



-00209* 





2 



26.10.1901 



Free ammonia 



-00183* 



-00144* 



3 



2.11.1901 



Free ammonia 



-00152* 



-00114* 



4 



28.11.1901 



Free ammonia 

 Albuminoid 



ammonia 

 Nitrites 

 Nitrates 



0-00194t 

 -00062 





 



-00071 1 

 -00081 





 



* Estimated by direct Nesslerisation. 



t Estimated, after distilling, by Nesslerisation. 



Table II. — Showing the Assimilation of Ammoniacal Nitrogen in 

 preference to Oxidised Nitrogen. 



Culture in a Sterilised Sewage Effluent (Land). 



Date of analysis. 





Control. 



Culture. 



Per cent, 

 nitrogen. 



Per cent, 

 nitrogen. 



31.10.1901 





0-000142 

 trace 





7.12.1901 



Nitrogen — 

 Total (by addition) 



-00009 

 -00007 

 -00215 

 



-00231 







-00025 

 0-00213 

 Faint trace 



-00238 



