RESEARCHES ON EVAPORATION AND DTSSOCTATION. 311 



Tempera- 



E. and Y. 





n. 



L. 



W. 



ture. 



Solid. 



Liquid. 



' , 





^ 







mms-. 



mriiN. 



Dims. 



■JIM)I,S, 



1UJU«. 



0° 



202 



8-30 



3-23 to 4-89 



7-6 





10 



5-li) 



0-88 



6-30 to 8-20 



12-1 





20 





11-73 



11-58 to 13-65 



18-9 



iii-o 



30 





20-(;i 





29-1 



30-5 



40 





34-77 







44-1 



45-5 



50 





56-56 







66-0 



72-0 



CO 





88-94 







97-4 



107-3 



70 





13G-0 







142-0 



1.55-2 



80 





202-3 







204-3 



232-9 



90 





293-7 







2',IO-6 



346-7 



100 





417-1 







408-5 



473-0 



110 





580-8 







... 





120 





794-0 









... 



Results aro .also given by Biuoan, at 15°, 7-70 mms. ; at 

 22°, 14-5 uima. ; at 32°, 23 mms. ; and by Naumann, at 78°, 

 185 mms. 



It will be seen that Landolt's and Wiillner's measure- 

 ments show little concordance with each other, and less 

 with those by Rognault, Binoau, Naumann, and ourselves. 



5. Method of ohtaininrj constant known temperatures {Trans. 

 Ohem. Soc, 1885, p. C40). — In the following table, which it 

 is desirable to reproduce in full, the tomporaturos are those 

 of an air thermometer, and the proasuros aro in mms. oF 

 mercury at 0°. It is necessary in using the method of 

 jacketing with vapours to correct these pressures to mms. 

 of mercury at the temperature of the room, which can be 

 done graphically with sufficient accuracy. The determina- 

 tions of the vapour-pressures of carbon disulphide and ethyl 

 alcohol are Regnault's. The rest are our own. 



