38 ROYAL SOCIETY OF CANADA 



iisme which were carried up and through the small internal cylinder. 

 Aa the drying progressed more of the liquid mixture was added to and 

 absorbed by the moss. Occasionally the contents of the moss space were 

 taken out mixed and then replaced and the trial continued. It lasted 

 about three weeks during which time 7364 grammes of urine were used. 

 The following shews the materials used with their nitrogen contents: — 



G-rammes Nitrogen 



263 grammes Caledonia Moss with 3.03 per cent N" 7.91 



150 grammes Welland Moss with 1.56 per cent N 2.34 



7364 grammes Urine with 0.82 per cent N. . 60.38 



250 grammes Oil of Vitriol, diluted 



Total 70.63 



Towards the end of the experiment there was considerable blacken- 

 ing of the moss, and some lumps were found at the bottom of the wire 

 basket. The product was thoroughly well mixed, sampled and analysed 

 for its fertilizing constitutents with the following result : — 



Per cent. 



Nitrogen 7.077 



Total Phosphoric Acid 0.800 



Potash, KoO 1.620 



Moisture 25. 770 



Ash 15.970 



It weighed in all 1015 grammes and contained 71.76 grammes 

 nitrogen; thus shewing a complete retention of that element. 



II. In order to ascertain how much nitrogen the acid added in the 

 foregoing experiment was capable of retaining by this method of treat- 

 iment the product of experiment I was further treated in an earthware 

 basin with fresh urine but without additional acid. The basin was very 

 gently heated so that the temperature of its contents seldom exceeded 

 80" C. The urine was added gradually 6371 grammes being used 

 which contained on the average of five determinations 0.83 per cent 

 nitrogen. The product was dried as well as possible, and, like the others 

 described in this paper, was analysed by Miss S. E. Wright, this time in 

 duplicate, yielding the following results: — 



1 2 



Nitrogen 8.79 8.76 per cent. 



Total Phosphoric acid P2O3 1.76 1.92 per cent. 



Potash K2O .' 1.73 1.68 per cent. 



Moisture 4.65 4.72 per cent. 



Ash 19.15 19.35 per cent. 



