The fact that an occasional carload shows from 1 to 3 per cent of acid soluble potash 

 is not a sufficient warrant for paying a premium on this form of agricultural lime. In 

 some instances lime kiln ashes are not stored as carefully as some of the other agricul- 

 tural lime products and are therefore likely to contain more water and insoluble inert 

 material. (An average of 82 analyses made at this laboratory shows 9.30 per cent of 

 water and 8.06 per cent of insoluble matter.) Lime ashes like all agricultural lircip 

 products should be bought on the content and cost of 100 pounds of effective oxides 

 of lime and magnesium delivered at the purchaser's railway station or farm. A 

 glance at the column headed "Cost of 100 pounds of effective oxides" in Table I 

 shows that the cost of lime in this form has averaged relatively high for 1923. 



GROUND LIMESTONE AND GROXJND SHELL LIME. 



A study of Table II shows that, with but one exception, the combined guarantee of 

 lime and magnesium oxides in this class of materials has been weU maintained. It is 

 true that in some instances one of the ingredients has fallen below the guarantee, but 

 the deficiency has been more than made up by an overrun of the other element. The 

 Oyster Shell Lime Dust put out by the Producers Sales Company showed a deficiency 

 of combined oxides of .88 per cent. This deficiency was undoubtedly caused by the 

 presence of nearly 12 per cent of insoluble matter or sand. From the nature of the 

 source of oyster shell lime the content of insoluble matter is apt to run relatively 

 high. The degree of fineness to which the raw lime products and shell lime have beeia 

 ground is graphically illustrated below. 



Per 

 cent 



100 



Paaaing 

 100 mesh 

 sieve 



90 



80 



70 



60 



50 



40 



Donald U. Smith 



Grangers Manufacturing, Co. 

 Pcwnal Lime Co. 

 Clifford L. Miller 



Producers Sales Co. 



Brewer & Co, 



Physical Condition of Ground Limestone found on the 

 Massachusetts Market. 



