OF STEAM ARISING FROM BOILING SALT SOLUTIONS. X9 



l»y slightly modifying the experiment, namely, by keeping the distil- 

 lation of the acetic acid at a very slow rate, while the solution was 

 kept boiling as briskly as possible, the steam-thermometer could be 

 made to indicate somewhat higher temperatures than the acetic acid 

 vapour, but far below the temperature of the solution. It was this 

 ■<3bservation, however, that led me to try the introduction of stenm 

 into the solution from without. 



y>y the introduction of steam into the boiling solution from 

 without, evaporation and condensation of steam in the solution can be 

 so readily and exactly counterbalanced, that its boiling temperature 

 may be maintained constant for any length of time and within a few 

 thousandths of a degree (_ entigrade. I am developing this part of my 

 observation f<3r the exact determination of the boiling points of vari(3us 

 solutions, and also for simplifying the determination of molecular 

 Aveights l)y tlie boiling method, which has, of late, been made tlie 

 subject of an extensive study by Beckmann. 



In conclusion I wish to express my warmest thanks to my 

 colleague Dr. E. Divers, F. 11. S., for many valuable criticisms ;ind 

 suggestions from time to time while this investigation was in progress, 

 and also to Dr. C G. Knott and Professor K. Yamakawa fnv ihe 

 interest which they have takei: in my work. 



