ILLUSTRATIONS. 



Fig. 1. (In text.) Chart for finding the calorific value of bituminous and sub- 

 bituminous coals from their proximate analyses, when analysis by the 

 ofiicial method is applicable. 



2. (In text.) Chart showing the ratio of the volatile combustible matter 



to the fixed carbon in Philippine coals when calculated free from water 

 and ash (pure coal). 



3. (In text.) Chart for finding the calorific value of Philippine coals when 



the proximate analyses are known. 

 S5320 3 203 



