Deficiencies in Calcium Oxide Neutralizing Value Shown in 

 Table I. 



Per Cent 



Brewer & Co., Inc Snow Fluff Agricultural Hydrate .3.24 



Brewer & Co., Inc Sure Crop Agricultural Hydrate . .57 



Herzog Lime and Stone Co. . Herzog's White Lime 4.18 



H.E.Millard Sweet Arrow Hydrated Lime . . .2.44 



New England Lime Co. . Nelco Agricultural Hydrate (Canaan) 1.95 



The Magnesium Agricultural Hydrate manufactured by B. K. Harris was 

 deficient 4.94% in magnesium oxide, but ran 8.15% over the minimum guar- 

 antee in calcium oxide, so that the calcium oxide equivalent was well maintained. 



Attention is called to the coarse grinding of several of the ground limestone 

 products listed in Table IL Although it may not be practical to grind lime- 

 stone so that it will all pass through a 100-mesh sieve, yet it is practical, as is 

 demonstrated by many manufacturers listed in this bulletin, to grind sufficiently 

 fine so that 80% will pass a 100-mesh sieve. The following products are com- 

 paratively speaking very much coarser and are therefore less immediately 

 effective in neutralizing soil acidity: 



Fine Ground Magnesian Lime Stone, American Agricultural Chemical Co. 



High Grade Ground Limestone, Hazen Bros. 



Hoosac Agricultural Limestone, Hoosac Valley Lime Co., Inc. 



Sealshipt Oyster Shell Dust, Producers Sales Co. 



Ashley White Dolomite Agricultural Limestone, D. U. Smith & Brother. 



Only one ground limestone showed a serious deficiency. Three samples of 

 Dragon Mainrok Finely Ground Magnesian Limestone, manufactured by the 

 Lawrence Portland Cement Co., showed deficiencies in both calcium and mag- 

 nesium oxides amounting to 3.09%, 2.98%, and 6.48%, respectively, in terms 

 of calcium oxide equivalent. 



Explanation of Tables of Analyses 



Table I, "Proportion of total oxides as carbonates." The data furnished 

 in this column are calculated from an actual determination of carbon dioxide 

 (CO2). Calcium or magnesium not in the form of carbonate is present either 

 as hydrated lime (water- or air-slaked), burned lime (caustic or unslaked), or 

 as basic silicate. All of the products listed in this table have at some time been 

 burned, and the proportion of oxides present as carbonates indicates to what 

 extent the product has absorbed carbonic acid from the air. 



Table II, "Carbonates of calcium and magnesium." The calculation in this 

 column allows for the small amounts of calcium and magnesium combined as 

 basic silicates; these are readily soluble in mineral acid solutions but obviously 

 should not be classed as carbonates. 



Under "Mechanical analysis" the figures represent in round numbers the 

 percentage of product that would pass the various meshed sieves mentioned. 



Tables I and II. "Neutralizing value expressed in terms of calcium oxide" 

 represents the acid neutralizing value of both the magnesium and the calcium. 

 The figures in the "per cent" column are obtained by a direct titration with 

 standard acid. The "pounds in one ton " are secured by multiplying the figures 

 in the "per cent" column by 20. 



"Insoluble matter" represents material which Is insoluble in dilute hydro- 

 chloric acid to which a few drops of nitric acid has been added. 



The figures in parenthesis following the brand name show the number of 

 samples collected and analyzed. 



