92 



EDITORIAL. 



Philippme coa/x arranged in order of di'crease in ash content — Continued. 



Source of coal. 



Ash 

 (per 

 cent). 



Luster of the coal. j 





7.86 

 7.48 

 7.22 

 0.95 

 6.50 

 6.20 

 6.00 

 4.38 

 4.17 

 4.12 

 3.81 

 3.77 

 3.70 

 3.49 

 3.28 

 2.60 

 2.50 

 1.92 

 1.61 

 1.61 



Sublustrous. 



Do. 

 Sublustrous to lustrous. 

 Sublustrous. 

 Sublustrous to lustrous. 

 Lustrous. 

 Dull to lustrous. 

 Sublustrous, uneven. 

 Lustrous. 



Sublustrous, uneven. 

 Lustrous. 



Do. 

 Dull to lustrous, uneven. 

 Lustrous. 



Do. 

 Very lustrous. 

 Lustrous. 

 Sublustrous. 



Do. 

 Lustrous. 





Philippine Islands 



Philippine Islands 



Cebu, near Carmen 





Polillo_ ___ . 



Polillo, Vista de Burdeus _ _ 



Cebu, Libing-bato 





Cebu 



Zaniboanga ^ _ 



Tayabas, Antimonan __ 









Batan Island, Military Reservation, coal seam No. 5__ 

 Rock Spring, Wyoming 



Mindoro, Bulalacao 



Cebu, near Carmen^ ___ 





■■■ Given above. 



These lusters of these coals were nearly all determined - at the same 

 time, they are therefore comparable and show that to a marked extent 

 they depend on the content of earthy matter. 



Perhaps there are also other conclusions which may be drawn from 

 the ash content of a coal. It is generally known that the value of a 

 coal increases with the size and continues until egg size and Imnp are 

 reached. It is also generally true that the heating power advances in the 

 same manner, but by no means in the same proportion as the aliove 

 factors. This increase is due, barring physical conditions, mainly to the 

 diminished quantity of ash which may be seen from the following figures 

 of Mr. Somermeier.^ The sample was thoroughly air-dried and separated 

 by sifting into various sizes and analyzed by the official method as noted 

 below : 



Size hi fractions of an inch. 



gV and finer 



j'a to 5>5 



jV to ^ 



A to ,1, 



J to A 



Moisture. 



2.05 

 1.90 

 1.70 

 1.45 

 1.15 



Volatile 

 combus- 

 tible 

 matter. 



35.54 

 38.05 

 38.55 



Fixed 

 carbon. 



59.66 

 58.40 

 58.35 

 58.55 

 58.20 



Ash. 



«.r5 



1.65 

 l.U) 

 1.20 

 1.60 



= This Journal, Sec. A { 1907) , 2, 50. 

 'J. Am. Ghem. Sac. (1906), 28, 1008. 



