98 “REport oF THE CHEMIST OF THE 
These trade values represent, as nearly as can be estimated, the 
average prices at which, during the six months preceding March, 
the respective ingredients, in the form of unmixed raw materials, 
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 preceding 
March plus about 20 per cent in case of goods for which there are 
wholesale quotations. 
TRADE-VALUES OF PLANT-Foop ELEMENTS IN RAW MATERIALS AND CHEMICALS. 
e 1898. 
Cts. per 
pound. 
Nitrogen in ammonia salts ....:....... Sashes ooveSiele wdts.tohelcn eae 14 
Nitrogen ‘in: nitrates -..o 20). ss creae « Ao aesiee @ 2 oi aiets eee 13 
Organic nitrogen in dry and fine-ground fish, meat and blood, 
WUE TEPHUZers: oo ss <oikh sacs ehee Oe eee cites eee eae a ee ne a 14 
Organic nitrogen in cotton-seed meal and castor-pomace ........ fe 
Organic nitrogen in fine-ground bone and tankage .............. 13% 
Organic nitrogen in coarse bone and tankage .............c.008 10 
Phosphoric “acid, water-soluble to... svc e ss eva tae ona laure eee 4\/, 
Phosphoric acid, citrate-soluDle sys sean wien wie eleeegn lee aa 4 
Phosphoric acid in fine-ground fish, bone and tankage .......... 4 
Phosphoric acid in coarse fish, bone and tankage .............. 3% 
Phosphoric acid in cotton-seed meal, castor-pomace and wood 
nD 6 cy: ne eT MO rs RAEN rash ge MR rh oa ck pe hae Ee a Se, eee 4 
Phosphoric acid in mixed fertilizers, insoluble in ammonium 
roth ily: RF 2 ie ete, 5 ae an a PP err ye Pert 9 3 SR Opa ate OES 6 2 
Potash as high-grade sulphate,-in forms free from muriates 
(chlorides).o4n. Ashes... Ges vaste are oes sate ie opesis Gana Sr 5 
Porta eth <1 Ta te Gass «died ste Saws, eek aves cif knoe she nthe sie eee een 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, 4 1-2 
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 4 1-4 cents a pound for potash, we can ealeu- 
late the commercial valuation, or the price, at which the separate 
unmixed materials contained in one ton of fertilizer, having the 
composition indicated in the preceding table, could be purchased 
for cash at retail at the seaboard. Knowing the retail prices at 
