48 



Drs. Ramsay and Young on 



CC1 CH 

 20. Chloral Methyl-alcoholate and Water. _ 1 OCH 3 . 



{ 



OH 



H 2 



Temperatures of water taken as correct. c= —'0005392. 



Pressures. 



Eatios. 



Absolute temperatures of 

 Chloral Methyl-alcoholate. 



From observed 

 temperatures. 



Smoothed. 



Eecalculated. 



Observed. 



millim. 

 50 

 100 

 150 

 200 

 300 

 400 



10639 

 10573 

 10532 

 1-0486 

 1-0439 

 1-0402 



10641 

 10570 

 1-0546 

 1-0489 

 1-0439 

 1-0400 



331-25 



343-2 



351-3 



356-2 



364-2 



3702 



33°l-2 

 343-3 



350-8 

 3561 

 364-2 

 3703 



The last two substances examined are solid throughout, and, 

 at the higher temperatures at any rate, dissociate completely 

 on being converted into vapour. 



21. Ammonium Chloride and Water. 

 tures of water taken as correct 



NH.C1 



H 2 



c=--0006667. 



Tempera- 



Pressures. 



Eatios. 



Absolute temperatures of 



NH 4 C1. 



From observed 

 temperatures. 



Smoothed. 



Eecalculated. 



Observed. 



millim. 

 50 

 100 

 150 

 200 

 300 

 400 

 500 

 600 



1-6855 

 1-6717 

 1-6650 

 1-6587 

 1-6546 

 1-6514 

 1-6478 

 1-6453 



1-6809 

 1-6720 

 1-6664 

 1-6620 

 1-6560 

 1-6511 

 1-6475 

 1-6441 



523-3 

 542-9 

 555-1 

 564-4 

 577-8 

 587-8 

 595 9 

 602-6 



524-7 

 542-8 

 554-6 

 563-3 

 5773 

 587-9 

 5960 

 603-0 



The determinations of the vapour-pressures and tempera- 

 tures of volatilization of ammonium chloride were attended 

 with great difficulties, and the agreement between the cal- 

 culated and observed temperatures is as near as could be 

 expected. The volatilizing-point at the atmospheric pressure, 

 calculated from the equation B/ = R + c(V — t), would be 

 338°'6 C, which agrees well enough with the temperature found 

 by experiment. 



