EVOLUTION OP GA8B8 FROM HOMOGENEOUS LIQUIDS. 



277 



was selected as a case for investigation. The results obtained also illustrated this 

 phenomenon of initial acceleration. Owing to the solubility of carbonic acid in water 

 some modification of the apparatus was necessary to collect the mixed gases over 

 mercury. 



The method adopted was as follows : Two tubes were wired together above and 

 below, of which one was graduated in cubic centimetres, the other in millimetres. In 

 the former the mixed gases were collected, while the latter served to indicate the 

 pressure in millimetres of the mercury column corresponding to each reading of the 

 other tube, both standing in a small trough filled with mercury. Thus each uncor- 

 rected volume of 10 c.c. could be reduced in terms of standard pressure and tempera- 

 ture ; due allowance was also made for the tension of aqueous vapour, the tube which 

 served for the collection of the gases being moistened with water. 12 grams of 

 crystallised oxalic acid were dissolved in 120 c.c. sulphuric acid; after complete 

 dissolution of the oxalic acid observations were made ; these are divided into sets of 

 50 c.c. each. 



Temperature 67-4-67 0< 6. 



In other series of experiments precisely similar results were obtained ; of these only 

 one need be quoted for illustration, made under conditions precisely similar to that 

 above, with the exception that the temperature was slightly higher, viz., 69'0. 



In the above tables the Series II. is practically continuous with the Series I., 



