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



Table V. — Showing the Assimilation of Ammoniacal Nitrogen, Forma- 

 tion of Albuminoid Nitrogen, and the Results of Centrifugalisation 

 Experiments. 



Culture in Sterilised Sewage, containing no Oxidised Nitrogen. 

 Started August 4, 1902. 











Culture of Chlovella 

 pyrenoidosa. 



No. of 



analysis. 



Date of 

 analysis. 





Control. 



Whole 

 culture. 



Clear 

 solution after 



centri- 

 fugalisation. 









Per cent, 

 nitrogen. 



Per cent, 

 nitrogen. 



Per cent, 

 nitrogen. 



1 



4.8.1902 



Free ammonia 

 Albuminoid 



ammonia 

 Nitrites and 



nitrates 

 Total nitrogen 

 (by addition) 







-00251 

 0-00033 



o-oo 



0-00284 







2 



9.10.1902 



Free ammonia 

 Albuminoid 



ammonia 

 Nitrites and 



nitrates 

 Total nitrogen 



-00258 

 00032 



o-oo 



-00290 



0-00145 

 -00068* 



o-oo 



-00213 





3 



14.10.1902 



and 

 15.10.1902 



Free ammonia 

 Albuminoid 



ammonia 

 Nitrites and 



nitrates 

 Total nitrogen 



-00233 

 -00029 



o-oo 



-00262 



-00131 

 -00108 



o-oo 



-00239 



-00115 

 -00041 



o-oo 



-00156 



4 



4.11.1902 



Free ammonia 



-00212 



-00049 



-00041 



5 



18.12.1902 



Free ammonia 

 Albuminoid 



ammonia 

 Nitrites and 



nitrates 

 Total nitrogen 





-00013 

 -00182 



o-oo 



-00194 



-00012 

 -00058 



o-oo 



-00070 



* Probably under estimated. 



