EXPLANATION OF TABLES OF ANALYSES 



In Table I, the column headed "Proportion of total oxides as carbonates" shows 

 not only the extent to which the lime and magnesium have absorbed carbonic 

 acid from the air in the effort to revert back to the original form when taken from 

 the quarry, but may also show the presence of imperfectly burned lime, known 

 as core, which is sometimes ground and made a part of the so-called agricultural 

 hme. Lime or magnesium not in the form of carbonate is present either in the 

 form of burned (caustic) lime or as hydrate (water slaked lime). 



The column headed "Pounds of effective oxides in one ton" gives the calculated 

 amount of lime and magnesium contained in one ton of the product, the assumption 

 being that all of the hme and magnesium from this source will become available 

 during a period of five years. 



The calculations found in the column headed "Cost of 100 pounds of effective 

 oxides in car lots f. o. b. plant" are based on prices furnished by the producers. 

 In estimating the probable cost on a dehvered basis, freight costs from shipping 

 point to destination must be added. 



In Table II, the data contained in the column headed "Pounds of effective 

 oxides in one ton" are calculated as in Table I, except that the degree of fineness to 

 which the Hmestone has been ground is taken into consideration as follows: it is 

 assumed that the lime and magnesium contained in that portion of the product 

 which will pass through a 20-mesh sieve will become available within a five-year 

 period, and what are contained in that portion which fails to pass through the 

 20-mesh sieve will be only 50 per cent effective during the same period. In both 

 tables the figures in parentheses following the brand name show the number of 

 samples collected and inspected. 



