



Mr. 



GL Ansdell. 







[June 15. 



I. 





IL 





III. 







IV. 



T. 



P. 



T. 



P. 



T. 



P. 



T 



P. 



. . 



27-84 



. . 



28-86 



. . 



33-17 







. . 31-8^ 



15 



40'66 



13-8 . . 



39-86 



16-3.. 



50-09 



19- 



) . . 51-93 



27 . . 



54-22 



255.. 



52-77 



25-4 . . 



63-98 



25-6 . . 60-46 



37-5 . . 



70-28 



do U . . 



67-36 



34-0 . . 



7702 







46 . . 



82-26 



44-0 . . 



76-23 



43-2 . . 



90-03 







47-2 . . 



92-21 



45-5 . . 



80-52 



45-1 





39- 



5 . . 80-28 



V. VI. VII. 



T. 





p. 



T. 



P. 



T. 



P. 









32-72 







o4 oo 







o4 '65 



17-5 





50-73 



18-8 . 



. 55-79 



18-8 .. 



. 5644 



26' 6 





63-31 



25-5 . 



65-68 



24-9 .. 



. 67 27 



35-0 





76-64 











37-6 





79-14 











CP. =38-0 





8135 



33-5 . 



. . . 77-69 



32-4 ... 



. 7723 





I = mixture containing 



17*18 per cent. 



CO,. 







11= 





j» 



19-37 



j> 







111 = 





SJ 



25-48 



>> 







rv= 





JJ 



42-44 



»» 







v= 





J» 



45-67 „ 



»» 







VI = 







74-18 







vn= 







82-14 



» 





T = temperature 



of mixed 



gases. 









P= pressure in atmospheres. 

 C. P = critical point. 



The critical points of the different mixtures are also plotted as a 

 curve on Plate II. where the ordinates represent the percentage 

 amount of carbonic acid in the mixture, and the abscissa? represent 

 the temperature in degrees (centigrade). Xow Pawlewski. in a short 

 abstract of a paper (" Berichte." Xo. 4. 16^2). describes a number of 

 experiments he had made with the isomeric ethers, the alcohols, &c, and 

 gives an equation to represent the critical point of mixtures of two or 

 more liquids belonging to the same class of organic bodies, in terms of 

 their respective critical points and relative weights, from which it 

 would appear that the critical point of mixed bodies is directly propor- 

 tional to the percentage composition of the mixture, when the origin 

 of temperature taken is that of the body having the lowest critical point. 

 He also mentions that this would probably be the case with the liquid 

 form of substances which are gaseous at ordinary temperatures : but 

 from our knowledge of liquefied gases, their physical constants are 5 i 

 much exaggerated with regard to their compression and expansion. &c. 



