Nature of Solution. 



365 



are so striking and so totally at variance with all received 

 ideas on this subject, while they agree so completely with the 

 theory of solution put forward by me in the paper of which 

 this is the continuation*, that I feel they possess sufficient 

 interest, and are of sufficient importance, to warrant their 

 publication, 



My method of experiment is as follows : — 



A wide test-tube A, 200 millim. by 30 millim., is fitted with 

 an india-rubber cork through the centre of which passes a 

 thermometer B. By a hole at the side of the thermometer is 

 attached the upright condenser C : this is made of thin- walled 

 wide glass tube, and is surrounded with a cylinder through 

 which cold water flows ; the upper end of the condenser com- 

 municates with the T-piece D, one arm of which has a stop- 

 cock, and the other is connected with a piece of capillary 

 tubing E, 100 millim. 

 long and about *3 mil- 

 lim. in internal diameter; 

 this in its turn is joined 

 to the gauge E, and has 

 a stopcock H by means 

 of which the whole may 

 be placed in communica- 

 tion with the atmosphere. 

 The gauge stands side by 

 side, in a trough of mer- 

 cury, with a barometer- 

 tube Gr in front of a 

 mirror-scale divided into 

 millimetres, the pressure 

 of the vapour in A being- 

 given by the difference 

 in height of the mercury 

 in Gr and F. In making 

 an experiment, a quan- 

 tity of salt along with a 

 piece of granulated zinc 



or tin is introduced into A, and water sufficient to rather more 

 than cover the bulb of the thermometer is then added. The 

 quantity of salt is so great that some of it remains undis- 

 solved at the highest temperature reached during the experi- 

 ment. The tube is then placed in position and surrounded by 

 a bath of water, the temperature of which is governed by a 

 thermostat. The temperature of the water is then raised to 



* Phil. Mag. February 1883. 



