FIELD EXPERIMENTS ON MANURE CONSTITUENTS. 



171 



Kooria mooria guano 



Sombrero phosphate, or crust guano 



Monks Island phosphate 



SuflPolk coprolites 



Cambridgeshire coprolites 



Estramadura phosphorite , 



Norwegian apatite 



Norwegian apatite treated with water charged 

 with carbonic acid 



It will be seen that the harder and the crystallized phosphatic minerals 

 yield a much smaller quantity of phosphate of lime to water than the more 

 porous and amorphous materials. 



Solubility of phosphate of lime in solutions of sal ammoniac. 



The solution of sal ammoniac employed in the following experiments con- 

 tained 1 per cent, of sal ammoniac. A large excess of phosphate of lime was 

 placed in a bottle and repeatedly shaken with a solution of sal ammoniac. 

 After a lapse of seven days the clear liquid was drawn from the undissolved 

 phosphate of lime and filtered ; 1 pint was then evaporated to dryness and 

 heated ; the residue was dissolved in a few drops of HCl, and the solution 

 precipitated with ammonia. 



In the same manner the experiments with bones, bone-ash, and Cambridge- 

 shire and Suffolk coprolites were executed, and the following results obtained : 



Amotmt of phosphate of lime dissolved hy ivater containing 1 per cent, of sal 



amtnoniac in solution. 



1 pint contained, 



Exp. 



grs. 



2-77 



Calculated 

 per gallon. 



grs. 



22-16 

 21-36 



•39 



^ phosphates ' 

 of lime and 

 magnesia 



•40 of bone-ash 



•37 „ 



( of phosphates 1 

 < of lime and > j 

 ( magnesia ) 



3-12 



Precipitated phosphate of lime (SCaO, PO5), "I 1st 



still moist J 2nd 2*67 



Pure bone-ash yielded to distilled water ] 



1*20 grs. of phosphate per gallon J 



Commercial bone-ash yielded to distilled 1 1st 



water 1*76 of phosphate per gallon J 2nd 



Coarse hard bone-dust yielded to distilled 1 , . 



water, after 3 days,^48 of bone-earth ; after y n a 



12 days, -80 J ^ ° 



Cambridgeshire coprolites yielded to dis- 1 i „f 



tilled water '56 grs. of phosphate per I Opj 



gallon I 



Suffolk coprolites yielded to distilled water ^ 1st 



•56 grs. of phosphate per gallon j 2nd 



In all these experiments the solubility of phosphate of lime has been con 



•12 after 3 days 

 •47 after 12 days 



•20 



•18 



'15 



•13 



3-20 

 2-96 



•96 

 3-76 



l^60 

 1-44 



1-20 

 1-04 



