Evans. — On Contact Metamorphism. 



557 



the experiment the neck of the tube retort was sprung off 

 above the bulb which contained the coke. 



Weighings, in Grammes. 



Tube (a), empty 

 + coal 



Flask (6), empty 

 „ +tar, &c. 



Tube (c), empty 



„ + tar, &c. 



Neck of tube (a) + tar 

 cleaned 



Bulb of {a) + coke 

 " (52-801 -18465) 



52-801) 

 62-859 i 



43-560) 

 46-572 f 



27-580) 



27-586 f 



18-604) 

 18-465) 



Total liquid distillate 



39-715) 

 34-336) 



Coke 



3-157 

 5-379 



That is, coal gave 31-38 per cent, of tar and water, 53-48 

 per cent, of coke, and 15-14 per cent, of gas and loss ; as 

 compared with 29-25 per cent, of tar and water, 57-25 per 

 cent, of coke, and. 13-50 per cent, of gas and loss of former 

 series. 



The silver - sulphide from the three wash - bottles gave 

 1-347 gr. of metalhc silver, equivalent to 0-2126 gr. of sul- 

 phuretted hydrogen, or 0-2001 gr. of sulphur. 



The coal contained 4-63 per cent, of sulphur, of which 

 {vide Part I.) 50-5 per cent., or 0-233 grammes, should have 

 been expelled in the gaseous distillate. 



That 83-8 per cent, of this calculated amount was actually 

 accounted for as sulphuretted hydrogen is a further justifica- 

 tion of the conclusions arrived at in Part I. 



Art. LIII. — Contact Metamorphism at the New Brockley 

 Goal-mi7ie (Malvern Hills). 



By Dr. W. P. Evans. 



[Read before the Philosophical Institute of Cayiterbury, 2nd November, 



1898.] 



The local metamorphism of carbonaceous beds, such as coal- 

 seams, is always interesting. The literature of the subject is, 

 however, somewhat scanty, and the conclusions arrived at by 

 different writers, especially as regards the distance through 



