OFFICIAL INSPECTIONS 62. 11/ 



insoluble the nitrogen would be likewise rated as high grade. 

 One showing a small amount of water soluble and a larger 

 amount of inactive than active would be classed as a poor grade 

 of organic nitrogen. The percentage of inactive as compared 

 with the total organic is the measure of the value of the organic 

 nitrogen in the goods. With a fair amount of organic nitrogen 

 soluble in water, a large per cent of active and a small amount 

 of inactive, the organic nitrogen is considered good. If but a 

 small amount is soluble in water and less active than inactive 

 is found the organic nitrogen would be considered low grade. 



The column headed "available nitrogen" is somewhat anal- 

 ogous to the available phosphoric acid column which has been 

 used for years. It cannot, however, be relied upon without 

 reference to the other results reported in the table. While as a 

 general rule the nearer the figures in the available column ap- 

 proach to the figures in the total nitrogen column the better the 

 grade of nitrogen in the goods this must be construed in con- 

 nection with the other preceding figures. The mineral nitrogen 

 is all available and consequently must be taken into considera- 

 tion in estimating the availability of the organic nitrogen. 



Lime. 



Two samples of limestone were registered, as follows : 

 "Edison Pulverized Limestone," Edison Portland Cement Co., 

 Stewartsville, N. J., guaranteed to carry carbonate of lime 90 

 per cent, total carbonate 93 per cent, carbonate of magnesia 3 

 per cent and calcium oxide 50 per cent. A sample taken from 

 Morison Bros., Bangor was examined as No. 3052, and found 

 to carry carbonate of lime 91.71 per cent, carbonate of magnesia 

 1.03 per cent, total carbonate 92.74 per cent and calcium oxide 

 51.36 per cent, and was, therefore, in accord with its guaranty. 



"R-R Land Lime," Rockland & Rockport Lime Co., Rock- 

 land, Me. Sample obtained from Kendall & Whitney, Port- 

 land. This brand was guaranteed by the manufacturers to 

 carry not less than 60 nor more than 65 per cent of calcium 

 oxide, not less than 0.5 and not more than 5 per cent magnesium 

 oxide, not less than 30 and not more than 40 per cent calcium 

 carbonate, no magnesium in the form of carbonate. On exam- 

 ination it was found to carry 63.38 per cent calcium oxide and 

 .78 per cent of magnesium oxide. 



