27 



Explanation of Tables of xYxalyses. 



In the first column will be found the name and address of the 

 fertilizer manufacturer and the names of the bravids analyzed. 



The second column designates the town where each sample 

 was dra^^^l. Where the words "manufacturer's sample" occur, a 

 certified sample was sent on by the manufacturer at our request. 



The column giving "dealer's cash price per ton" shows the 

 cash price that was charged the consumer for one ton of fertilizer 

 at the place where the brand was collected. There are in some 

 instances very wide difi:crences between the prices which were 

 charged by various agents for the same brand. These variations 

 have, however, been verified by the agents in writing and so are 

 published for what they are worth. 



The "valuation" column shows the retail cash cost in our 

 large markets or centers of distribution of amounts of nitrogen, 

 phosphoric acid and potash, equivalent to those found in one 

 ton of the fertilizer. 



' The "percentage of difference" column shows the percentage 

 excess of the retail cash price over the valuation, another manner 

 of expressing the difference between the cash cost and the com- 

 mercial valuation of the fertilizer. 



The "laboratory number" is simply a reference number used 

 in the collection and analyses of the various brands. 



In the nitrogen column the water soluble nitrogen includes 

 nitrogen as nitrates and as ammoniates, with more or less amido 

 compounds, in case of acidulated goods, which rank with the 

 ammonia compounds in availability. The organic nitrogen, as 

 expressed in the tables, is that part of the total nitrogen insoluble 

 in water. The total nitrogen includes all foiTns of nitrogen present. 



In the phosphoric acid column the insoluble phosphoric acid 

 is that part of the total phosphoric acid insoluble in water or a 

 neutral solution of citrate of ammonia. The reverted phosphoric 

 acid is that portion dissolved by a neutral solution of citrate of 

 ammonia (specific gravity 1.09) by treating two grams of the 

 fertilizer, previously washed with water, with 100 c.c. of the 

 citrate solution one-half hour at 65^ C. It is supposed to represent 

 that part of the phosphoric acid insoluble in water but soluble 

 in soil and root acids — it represents the difference between the 

 total and the sum of the soluble and insoluble phosphoric acids. 

 The available phosphoric acid column represents the sum of the 

 soluble and reverted phosphoric acid. 



The potash column shows the per cent of potash soluble in 

 water; results published without an asterisk (*) indicate that the 

 potash is present as chloride or that sufficient chlorine is present 

 in the fertilizer to unite with all of the potash. Foot-notes indi- 

 cate the amount of potash present as sulfate and carbonate. 



The guarantee columns show the minimum percentage of 

 nitrogen, total and available phosphoric acid, and potash guaran- 

 teed by the manufacturer to be present. 



