XVill. ABSTRACT OF PROCEEDINGS. 
the stopper of the extractor. The sac is made by coating the 
inside of a test tube with collodion solution and removing the coat- 
ing when dry. The water from the condenser is led by the tube 
C to the bottom of the extractor. In this way a thorough renewal 
of the dialysate is ensured, and the dropping of water into the sac 
is prevented. The liquid in the extractor is maintained at constant 
level by the tube D, which is inserted into the opening of the siphon 
by means of a piece of rubber tubing. The opening of the thistle 
funnel, #, which serves for the admission of liquid, lies below the 
level of the dialysate. When the water in the flask is boiled, a 
flow through the dialyser proceeds. Steam passing through the 
side tube /’, heats the contents of the dialyser to 60° — 70° C., and 
maintains the temperature at this level during the course of the 
dialysis. If the dialysis is to be carried out with cold water, the 
upper opening of the side tube /’is plugged, and a tube G is inserted 
into the lower end of the extractor extending below the level of 
the water in the boiling flask. Access of steam to the contents 
of the dialyser, either through the side tube or the siphon, is thus 
prevented, and no heating takes place. An apparatus of the size 
described will completely dialyse 100 cc. of liquid with a total 
volume of water of 250 cc., and has been in use in the Physio- 
logical Laboratory of the University since 1915.” 
2. His Honour Judge DOCKER, exhibited a specimen of 
petrified wood, Dadoxylon australe, from Cherry Tree Hill 
near Capertee. 
DECEMBER 4th, 1918. 
The four hundred and third General Monthly Meeting 
was held at the Society’s House, 5 Elizabeth Street, 
Sydney, at 8 p.m. : 
Mr. W.S. Don, President, in the Chair. 
Twenty-eight members were present. 
The minutes of the preceding meeting were read and 
confirmed. 
