288 State Board of Aguicultuue, etc. 



manurial value, particularly potash and gypsum ; the first is 

 usually present in too small quantities to be regarded, and 

 the second is too cheap to be estimated as an ingredient of a 

 high priced fertilizer. The ammonia and the phosphoric 

 acid are the chief ingredients of value in these compounds^ 

 and accoi-ding to the amount of these in any given sample, 

 so will its actual value be. 



The condition wliicli the phosphoric acid is in, whether 

 soluble in water and so ready to be used at once by the 

 plant; or reverted, that is, having once been soluble, but on 

 its way back to the opposite condition, and yet soluble in 

 some alkaline salt; or insoluble, that is, not soluble in either 

 of these, but soluble in acids, will also determine to a great 

 extent their worth. 



Upon the amount of actual or potential ammonia, and 

 upon the amount and condition of the pliosphoric acid, the 

 following values are calculated, and upon a ton of -^,000 

 pounds. The market value of these substances in other 

 forms will be a guide in estimating tlieir value in a manure; 

 and there is a pretty uniform basis upon which agriiuiltural 

 chemists have settled the price of these rarer ingredients. 



Professor Collier in the first State Report, that of 1872, 

 adopted the following estimation of values, which is adhered 

 to here, as it will aiford a good means of comparison with 

 the results of the more recent analyses. This scale of prices, 

 as the Professor has recently said, is manifestly too high, as 

 equivalents can now be purchased in the mui-ket at less rates. 



In the first part of the second series the reverted and 

 insoluble pliosphoric acid were not separated, and both are 

 reckoned together as insoluble. 



