184 cox. 



W. Brinsmaid ^^ has shown that in an Illinois coal each one per cent 

 of ash as weighed equals 1.13 jjcr cent of- ash in the coal. 1.13 per cent 

 error on a coal found to contain 10 per cent of ash, is not inconsiderable. 

 As a small offset to this error, the combustion of the sulphur develops 

 some heat, but this is an extremely small factor in Philippine coals. 



Great unity in results are obtained with Philippine coals when the 

 smoking-off method of analysis is used. 



The proximate analyses and calorific values of most of the known 

 Philippine coals are given in Table II. 



"Journ. Ind. and Chem. Eng. (1909), 1, 67. 



