30 



Lime The annual inspection has necessitated the examina- 



Compounds. tion of 53 lime products. Forty-one analyses, 



representing 35 different brands, have been made. 



They are grouped in the tables as follows: 



Burned or caustic lime. 2 analyses, representing 2 brands, 



Hydrated or slaked lime, 13 



2 

 12 

 1 

 6 

 10 

 1 

 3 



Precipitated lime, 2 



Lime ashes. 7 



Ground limestone, 12 



Marl, 2 



Gypsum or land plaster, 3 



The same form as in the past has been adhered to in the publi- 

 cation of results. On the left hand page will be found the percentages 

 of the various constituents, as determined by analysis. On the 

 right hand page, will be found the probable combinations as existing 

 in each sample. These figures are computed from the analytical 

 data. 



The following summary table gives the highest, lowest and av- 

 erage cost of 100 pounds of calcium oxide from the various sources, 

 so far as cost data is available. 



An important point in connection with th^i purchase of ground 

 limestone, which frequently is given too little attention, is its me- 

 chanical condition. Dr. Hartwell of the Rhode Island Experiment 

 Station has shown that the activity of this class of lime products 

 depends upon the degree of fineness, and that when ground to pass 

 a 100 mesh sieve, it compared favorably in action, during a season, 

 with the hydrated or slaked limes. (See Rhode Island Extension 

 Service Circular No. 6, Vol. 1, November, 1914.) The mechanical 

 analyses of each brand of ground limestone inspected will be found 

 in the tables. 



It may not be out of place at this time to submit a compila- 

 tion of results which show the average lime requirements of soils 

 tested at this laboratory during the past three years. These analyses 

 have been made for individual farmers in various localities in the 



