of Edinburgh, Session 1878-79. 53 
performed many times in succession on the same specimen with the 
same results. 
Professor Clerk-Maxwell informs me that similar results are to he 
obtained with gutta-percha, drawn out when cooled , after being 
boiled in water. 
The subject is especially interesting as an exaggerated example of 
the Elastische Nachwirkung , which has recently been discussed at 
great length by Boltzmann and others. 
The following Gentlemen were duly elected Fellows of the 
Society : — 
J. B. Brown Morrison, of Finderlie and Murie, Perthshire. 
Andrew Wilson, Ph.D., 118 Gilmore Place. 
James Lambert Bailey, Ardrossan. 
Kobert Cox, Gorgie, Murray field. 
John Hislop, Sec. to the Dep. of Education, New Zealand. 
James Cossar Ewart, M.D., 12 Alva Street. 
George Wm. Balfour, M.D., 17 Walker Street. 
Monday , 20 th January 1879. 
DAVID STEVENSON, Mem. In. C.E., Vice-President, 
in the Chair, 
The following Communications were read : — 
1. On the Action of Heat on the Salts of Trimethyl- 
sulphine. No. III. By Professor Crum Brown and 
J. Adrian Blaikie, B.Sc. 
I. Acetate of Trimethyl- Sul 'phine. 
The acetate is formed by treating the iodide of trimethyl-sulphine 
with acetate of silver. On leaving the strong solution over sulphuric 
acid in vacuo for three weeks no crystallisation took place. The syrup 
on being heated in a small retort gave off water, and, without solidi- 
fying, sulphide of methyl, mixed with acetate of methyl. On re- 
distilling the two latter, they went over at a temperature between 45° 
VOL. X. 
H 
