Vol. 54.] HEATHFIELD STATION (sUSSEX). 573 



Under these circumstances it was very desirable to make a full 

 elementary analysis, which was carried out with a snmple dried at 

 110° to 115° Centigr. In this case we have to deal with 18*18 per 

 cent, of organic material and 81-82 per cent, of ash. 



Per cent. 



Carbon 943 



Hydrogen l'S3 



Nitrogen 0-68 



Sulphur 1-27 



Oxygen (by difference)... 497 



Ash 81-82 



100-00 



The sulphur is here reckoned with the organic material ; considering, 

 however, that on burning the shale the smell of sulphur dioxide is 

 noticeable, and moreover that the ash contains some 2g per cent, of 

 sulphur trioxide (as sulphates), it is very probable that the sulphur 

 of the shale actually exists as pyrites. If so, this will make the 

 oxygen percentage, obtained by difference, considerably too low. 

 Taking the above figures, however, and making no correction 

 for the oxidation of sulphides, we should obtain for the 

 organic material of the shale the following result : — 



Per cent. Per cent. 



Carbon 9-43 51-87 



Hydrogen 1-83 10-07 



Nirrogen 0-68 3*74 



Sulphur 1-27 6-99 



Oxygen 4-97 27-33 



18-18 100-00 



The ash gave the following results on analysis : — 



Per cent. 



Silica (SiOs) 59-72 



Alumina (AI2O3) 24-40 



Ferric oxide (Fe.Og) 703 



Linie(CaO) ...■; 214 



Magnesia (MgO) 0-96 



Sulphur trioxide (SO3) 2-54 



Phosphorus pentoxide (PgOg) absent 



Alkalies and loss (by difference) on analysis 321 



100-00 



In conclusion,! desire to express my cordial thanks to Mr. Billinton 

 for the courtesy and kindness with which he placed material at 

 my disposal in the course of this investigation. 



Discussion (on the two preceding Papers). 



Mr. J. E. Claek remarked that, in view of the strong divergence 

 in the analyses, it would be of interest if the new method by 

 liquefaction could be applied, by the co-operation of the Royal 

 Institution. The idea of collecting the possible gas escaping at 



