( 195) 



decreases on the contrary in proportion as they contain more phenol. 

 The extreme limits are 68° and 167°. 



Dr. ScHREiNEMAKERS has also investigated how the critical mixin»- 

 temperaiure of water with phenol is changed by the addition of 

 sodiumchloride. In the following table the results are o'iven. 



Compositiou of the binary mixture 



ia Moleo. NaCl on lOOMoleo. 



(H., O + Na CI). 



" . . . . 



0.304 . . . . 



Critical mixingtemperatures 

 after the additiou of 

 pheuol. 

 . . . 68° 

 ... 78° 



1.579 123° 



2.084 144° 



If we now indicate in fig. 3 on the X-axis the binary mixture 

 viz. Molec. Na CI on 100 Molec. (Na CI + HjO), and on the F-axis 

 the critical mixingtemperature of those mixtures with phenol we 

 get the dotted line dj\ rising very quickly. A similar line also 

 exists in the system investigated by Schreinemakeks of water- 

 succinonitrile and sodiumchloride. 



By the addition of aniline or Na CI we therefore get a rise in 

 the critical mixingtemperature of phenol with water; the same 

 occurs also if the pressure is augmented, as lately shown by Dr. 

 N. J. VAN DEE Lee '). A fall in the critical mixingtemperature can 

 also occur, as Dr. Schkeinemakers found with alcohol. 



A line quite different from that in fig. 3 is found bv Scukeine- 

 MAKER8 in the system: water, alcohol and succinonitrile. 



If we start from the bi- 



f-ic^A 



Moke, akolwl on 100 Molec. iraler -|- tilcohol. 



nary mixture water and 

 alcohol, we can again get 

 two liquid layers by the 

 addition of succinonitrile. 

 In fig. 4 the composition 

 3i's of the binary mixture: 

 water and alcohol is read 

 on the ;r-axis, while on the 

 y-axis we find the critical 

 mixingtemperature by the 

 addition of succinonitrile. 

 The course of the line dd'c'e 

 is known from the followino- 

 table: 



') Dissertation. Tlie infl\ieiice of pressure on the critical mixiugtemperature. Am- 

 sterdam 1898. 



