148 THE ROYAL SOCIETY OF CANADA 



per cent and 7-02 per cent available phosphoric acid respectively 

 by the two methods of analysis employed. While in the case of the 

 Florida Pebble Phosphate no very marked increase in the percentage 

 of available phosphoric acid resulted from mixing the materials wet 

 and allowing them to stand, the wet mixes, using Canadian Apatite, 

 were decidedly richer than the corresponding dry mixes in this con- 

 stituent. 



