[ 8 3 i ] 



continued, several times, and each time, the supernatant 

 liquid is drained off into the green-bottle, until the residue in 

 the mortar appears quite siliceous. The mortar is then 

 cleaned out perfectly with the remaining quantity of water in 

 the wash-bottle, and the contents of the mortar wholly trans- 

 ferred into the green-bottle. The bottle is then stoppered 

 up, and shaken every now and again for 3 hours together. 

 It is then left to settle for over 12 hours. 100 c.c. ara then 

 filtered through into a clean measured cylinder from a Swedish 

 paper-filter. This 100 c.c. containing the soluble phosphate 

 in i gram of super, are transferred into a beaker ; and the 

 Calcium Carbonate and the Magnesium Phosphate are sepa- 

 rated out in exactly the same way as in the case of the total 

 lime and phosphate in one gram as already described. Only 

 in this case the Calcium Oxalate precipitate after being tho- 

 roughly washed, is thrown away, and the filtrate treated in 

 order to find out the Monocalcium Phosphate. 



(7) Ca 3 P 2 O 8 . This is found out by difference as per 

 calculation. 



1,410. The following calculations refer to an actual ana- 

 lysis of a sample of super : 



(1) Moisture. 



Watch-glass and clip and raw super 



(3 grams) ... ... =28-42875 



Watch-glass 4- clip + dry super ... =27-93500 



Moisture in 3 grams ... ='49375 



/. Moisture in i gram ... =-16458 



= 16-46% 



(2) Loss on ignition. 



Crucible + lid + raw super (i grm.) ... =30-3280 

 Crucible + lid + ignited super ... =30-0375 



2905 



=29-05% 



