( 582 ) 

 y. Point of contact isothermal (23°. 29 C). (j. Isothermal of 25°.20 C. 



This mixture has been prepared in a simpler mixing apparatus 

 than that referred to in this ('onim. 11 § 8, and the pressures are 

 measured with an aii- manometer and tho]i reduced to the indications 

 of the hydrogen manometer used later, as said iu III § 3. 



Of the l)order curve it may be remarked that below 1 9°. 38 C 

 the end condensation pressure decreases at a falling temperature, 

 which has not been observed by Yersciiaffklt in mixtuies of carbon 

 dioxide and hydrogen at the temperatures at which he oltserved. 



Between the plait|)oiul- and the i)oint-of-c()nta('t-1emperature there 

 was retrograde condensation of the lirst kind (temporary liquid phase). 



