ANALYSES OF COTTON PLANT AND SEED. 191 



sulved in water, filtered and washed, then dried and burned. 

 It weighed, after burning, 0'403 grammes, silicic acid, (Si0 2> ) 



The liquid filtered from the sand and silicic acid, (measured 

 in a graduated tube,) was found to contain four hundred and 

 eighty cubic centimetres, which was divided into three equal 

 parts of one hundred and sixty cubic centimetres, each = 

 2'OGO grammes of the ash, for each one hundred and sixty 

 cubic centimetres of the liquid. 



These three parts will be termed A, 13 and C. 



In A, the phosphate of iron, lime and magnesia, were esti- 

 mated. 



In B, the sulphuric acid, and the entire quantity of phos- 

 phoric acid. 



In C, the alkalies. 



The liquid A was nearly neutralized with ammonia, then 

 acetate of soda and free acetic acid were added. The precip- 

 itate was left standing for twenty-four hours, after which it 

 was filtered, and washed out with boiling water, then dried and 

 burned. It weighed O346 grammes, or, for the entire liquid, 

 1-038 grammes of 2FeA3PO 5 , or 0*507 grammes of Fe. 2 3 

 (oxide of iron). 



The liquid filtered from the precipitate of phosphate of iron 

 was treated with oxalate of ammonia. The precipitate of 

 oxalate of lime, was filtered, washed, dried and burned. It 

 weighed, after burning, 0'643 grammes of carbonate of lime, 

 (CaO,CO,,) or for the entire liquid, 1'929 grammes of CaC^Co,, 

 = T092 grammes lime (CaO). 



The liquid filtered from the oxalate of lime, was evaporated 

 over a water bath, to a smaller volume, then phosphate of soda 

 and ammonia were added, and the precipitate left standing for 



