of Edinburgh, Session 1871-72. 
663 
glue ; in the other, of carefully made india-rubber tube four or 
five millimetres in thickness, of a very small uniform bore, made 
expressly for the purpose by the Edinburgh Rubber Company. 
The iron funnel-shaped receptacles are ground at the inner apex, 
so as to fit perfectly finely-ground iron tubes. By means of these 
tubes the preliminary exhaustions are made by a band pump, 
and then they are withdrawn. This device saves a separate joint. 
The barometer tubes are attached to solid T-shaped pieces of iron 
tube, and between these pieces and the main tubes each has a 
small glass bulb. Both forms work for all practical purposes as 
well as glass, and suit admirably for Erankland’s water analyses, 
and Graham’s experiments, &c. They may be procured from 
Mr Cameron, philosophical instrument maker, South Bridge, Edin¬ 
burgh. 
5. Professor Alexander Dickson exhibited a large series of 
abnormal cones of Finns Pinaster which were to form the 
subject of a future communication to the Society. 
The following Gentleman was balloted for and admitted 
as a Fellow of the Society :— 
Archibald Constable, Esq. 
Monday , 4 tli March 1872. 
Professor MACQUORN RANKINE, Vice-President, 
in the Chair. 
The following Communications were read :— 
1. On the Connection between Chemical Constitution and 
Physiological Action— Continued. On the Physiological 
Action of the Salts of Trimethylsulphin. By Prof. Crum 
Brown and Dr Thomas R. Fraser. 
In the former parts of this investigation we studied the physio¬ 
logical action of the salts of a considerable number of ammonium 
