22 



Transactions. 



Each degree makes an average increase of 8-5 x 10"" in the conductivity, 

 till at about 8-2° a sudden break in the conductivity curve takes place, 

 presumably due to all the hydrate having been decomposed. Thereafter 

 the effect of raising the temperature is much less, on an average about 

 4 X I0~" ohms per degree. 



D. Pressure = 25 atmospheres. Readings with descending tempera- 

 tures : — 



The hvdrate formed suddenly at about 2-1° C. 



E. Pressure released from 25 to 20 atmospheres, and a complete and 

 consecutive series of determinations similar to the last made, using both 

 ascending and descending temperatures. The hydrate which had been 

 formed at 25 atmospheres was kept in existence by keeping the tempera- 

 ture low. The following results were obtained (pressure = 20 atmo- 

 spheres) : — 



