152 Scientific Proceedings, Royal Dublin Society. 



funnel, which costs about half-a-crown, an ordinary thistle-funnel 

 costing three halfpence. A piece of glass rod is pulled out in the 

 Bunsen flame so that its end tapers somewhat. By means of a 

 little emery powder and turpentine, this can be quite easily ground, 

 so as to form a kind of long-handled stopper to the bottom of the 

 thistle-funnel, thus forming a convenient substitute for the stop- 

 cock, although the adjustment of the level of the water in the 

 narrow-bore tube to a given mark is not quite so easily carried out 

 with this arrangement (as shown in fig. 2, p. 151, the stopper B 

 being held in its place by means of wires fastened across the top 

 of the funnel) as with the tapped funnel. 



