379 



Benzenesulphonani'de when cooled in ice and salt gives with 

 absohite nitric acid but little gas but this increases on elevation of 

 temperature. 



The sulphonw'obutyric diamide of Moll van Charante dissolves 

 slowly in absolute nitric acid without evolution of gas even after 

 two days and is reprecipitated unchanged by addition of water 

 particularly on neutralising the acid. 



Hence also in regard to absolute nitric acid this substance behaves 

 quite differently than was to be expected from the diamide. 



Finally, it may be mentioned here that just as Hinsberg prepared 

 benzenesulphonnitramide from benzenesulphamide by means of nitric 

 and sulphuric acid at low temperatures, ethylsulphonnitramide is to 

 be obtained also from ethanesulphonamide in this manner, though 

 with a poor yield, as a substance crystallizing beautifully from 

 benzene in v^^hich it is fairly soluble and melting at ± 70°. 



Chemistry. — "The distribution of a colloidally dissolved substance 

 over two layers'. By Prof. W. Reinders. (Communicated by 

 Prof. Schreinemakers). 



(Communicated in the meeting of September 27, 1913). 



J. When three non-miscible liquids meet, three things may 

 happen depending on the values of the contact surface tensions 

 ^i,2, ^>2,3 and Ö3 1, apart from the action of the gravitation ; either the 

 three phases meet in one common side or one of them expands 

 between the other two and prevents these from coming into contact. 

 The first will happen if none of the three contact surface tensions 

 is greater than the sum of the other two ; the second if this should 

 be the case. If, for instance (Ji_2 >> 09^3 -f- 03,1, 3 will expand between 

 1 and 2 ^). 



2. If one of the phases (3 for instance) is solid and the other 

 tw^o liquid we can again distinguish the same two cases with this 

 difference, however, that when Oi^, ]> 02,3 + ^3,1, the expansion of 

 3 between 1 and 2 is not possible. Phase 3 will then arrive at the 

 contact surface of i and 2. 



Let us now suppose the phase 3 to be 

 in the form of a small globule. There 

 will then be an equilibrium if 0^1 3 =1023 

 -|- öx^'i, cos a. If <ji_3 > ^2,3, cos a will be 

 positive and « <^ 90°. The greater part 



1} Quincke. Consult the test-books, for instance Bosscha-Kuenen II, 658. 



