EXPLANATION OF TABLES OF ANALYSES. 



The analyses of lime products are presented in two groups. In Table I are found 

 the brands of caustic, hydrated or slaked, precipitated and air-slaked limes, and of lime 

 ashes. The first column gives the names of manufacturers and brands. The next 

 two double columns give the amounts of calcium and magnesium oxides found by 

 control analyses and guaranteed by the manufacturer. The next single column is 

 calculated from the detailed chemical analysis, and shows in round numbers the pro- 

 portion of calcium and magnesium oxides which are present as carbonate, the balance 

 in each case being either hydrate or caustic lime. The next column gives the calcium 

 and magnesium oxides in 1 ton of the product, it being assumed that they will all 

 become available during a five-year period. The last double column shows the cash 

 cost of 100 pounds of effective oxides, f. o. b. kilns, in minimum car lots, in bulk or in 

 sacks as the case may be. Quotations furnished by the manufacturers are the basis 

 for these estimates in all cases. 



In Table II are given the brands of raw ground limestone and groimd shell lime. 

 As in Table I, the first column gives the names of manufacturers and brands. The 

 next two double columns show the amounts of calcium and magnesium oxides found 

 and guaranteed. The next double column shows the purity of the product; or, ex- 

 pressed in another way, the equivalent of calcium and magnesium carbonates as cal- 

 culated from the detailed analyses and as guaranteed by the producer. The column 

 headed "Pounds of Effective Oxides in 1 Ton" represents the amounts of calcium and 

 magnesium oxides which will probably become effective during a five-year period. 

 The computation is based on both physical and chemical analyses, and, furthermore, 

 on the assumption that limestone which fails to pass a 20-mesh sieve is only partially 

 effective within the limits of a five-year period. This assumption is based on experi- 

 mental evidence. The last double column gives cost data of effective oxides the same 

 as the corresponding columns in Table I. 



In both tables, the numeral in parentheses immediately following the brand name 

 indicates the number of samples inspected. 



In cases where a long haul from the railroad station to the farm is necessary, it is 

 important that this extra item of expense be carefully considered. It has been esti- 

 mated by the officials of the National Lime Association that hauling costs about 50 

 cents per ton for the first mile and 30 cents per ton for each additional mile. This 

 item might in some cases indicate the desirability of selecting a lime product richer in 

 calcium and magnesium oxides, even though the initial cost of 100 pounds of its effec- 

 tive oxides, f. o. b. kilns, might be somewhat greater than for ground limestone or 

 some of the other lower analysis lime products. 



