New Yorx AGRICULTURAL EXPERIMENT STATION. 235 
could be bought at retail for cash in our large markets. These 
prices also correspond (except in case of available phosphoric 
acid) to the average wholesale prices for the six months pre- 
ceding March plus about 20 per ct. in case of goods for which 
there are wholesale quotations. 
TRADE VALUES OF PLANT-Foop ELEMENTS IN RAW MATERIALS AND CHEMICALS. 
1899. 
Cents per 
pound. 
Nitrogen in ammonia salts ........ 0... es eee ec cece er cece eecece 15 
PREE HOMIE MILTALCS 2c 2 se nts DE tits Gold Nh es Dern wie dene See 12% 
Organic nitrogen in dry and fine-ground fish, meat and blood, and 
RIMEEMMETOLUNLUZET. OC! 00 fn ut'. ig bike tag ola'e'e'e Wierd bc hie wie orale eMatele wets 14 
Organic nitrogen in cotton-seed meal and castor-pomace........... 12 
Organic nitrogen in fine-ground bone and tankage ................. 14 
Organic nitrogen in coarse bone and tankage .................+--- 10 
Phosphoric: acid; water-soluble ..2. 2. es ee eee tee eee 41% 
Piaepioricencid, scitrate-soluble—... icc ied aves peas ee bees cee es 4 
Phosphoric acid in fine-ground fish, bone and tankage ............. 4 
Phosphoric acid in coarse fish, bone and tankage .............se00. 2 
Phosphoric acid in cotton-seed meal, castor-pomace and wood ashes.. 4 
Phosphorie acid in mixed fertilizers, insoluble in ammonium citrate 
RE ee rte RR reat cee Os aloe a vemos Te rpr Sys * a ages wih cebd eee 2 
Potash as high-grade sulphate, in forms free from muriates (chlor- 
PETER CLM ee a8 Wet od ain yk sa dk ck OR toe mae aren ta 5 
on Sune VAN SE Aco as MR SSIs 0 Pe a PR ie aa ee 4% 


COMPARISON OF SELLING PRICE AND COMMERCIAL VALUATION. 
Giving to the different constituents the values assigned in the 
schedule for mixed fertilizers, 14 cents a pound for nitrogen, 44 
cents a pound for water-soluble phosphoric acid, 4 cents a pound 
for citrate-soluble phosphoric acid, 2 cents a pound for insoluble 
phosphoric acid, and 44 cents a pound for potash, we can cal- 
culate the commercial valuation, or the price at which the sep- 
arate unmixed materials contained in one ton of fertilizer, hay- 
ing the composition indicated in the preceding table, could be 
purchased for cash at retail at the seaboard. Knowing the retail 
prices at which these goods were offered for sale, we can also 
readily estimate the difference between the actual selling price of 
