[miller] chemical LABORATORY RESEARCHES 271 



Fumaryl chloride with benzene and aluminium chloride gave 

 dibenzoyl-ethylene (trans) ; when toluene was used instead of benzene 

 the product was di-p-toluylethylene (trans) and when m-xylene was 

 used the product was di-2, 4-xylylethylene (trans) . 



Preparation of Dust-free Liquids 



By C. M. Anderson 



Presented by Professor F. B. Kenrick, F.R.S.C. 



The difficulty of preparing dust-free liquids by filtration through 

 collodion films appears to be due to a disintegration of the film itself 

 after some hours use. Water has been prepared almost dust-free by 

 the use of a film supported by a fine mesh wire screen, with an auto- 

 matic syphon by means of which sufficient rinsing of the receiver 

 could be efi"ected before the disintegration of the film began. 



Supersaturated Solutions of Gases 



By K. L. WisMER, B.A. 



Presented by Professor F. B. Kenrick, F.R.S.C. 



It was hoped that the slow formation of bubbles from super- 

 saturated aqueous solutions of gases would be more easily controlled 

 and followed than the more violent vaporization of superheated 

 liquids, and that in this way some clue to the cause of bubble form- 

 ation would be obtained. Solutions of oxygen and of carbon dioxide 

 were investigated at atmospheric pressure at concentrations cor- 

 responding to pressures up to about 50 atmospheres in the case of 

 oxygen and 35 in the case of carbon dioxide. The results obtained 

 up to the present seem to justify the following conclusions: 



1. A long heating of tube and solution at high temperature was 

 found to favour supersaturation. 



2. The time interval between the reduction of pressure and 

 appearance of a bubble varies between wide limits even under 

 apparently identical conditions. 



