44 



McBAIN 



[1899 Masson 



1899. 0. Masson and B. D. Steele. 



The Blue Salt of Fehling's Solution and other Cuprotartrates. Jour. Chem. 

 Soc, 73, 725. 



Two flasks containing Pt electrodes surrounded by a neutral 

 Fehling's solution, prepared by saturating a potassium hydroxide 

 solution with cupric tartrate, were connected by a horizontal 

 tube filled with a normal solution of sodium chloride solidified 

 by gelatine. A blue color (complex anion) moved into the 

 tube from the cathode but not from the anode side. In a 

 second experiment where the anode vessel was filled with 

 cupric sulphate solution, a dark blue color moved as before up 

 the tube from the cathode flask, and a light blue (cupric 

 chloride) from the anode end ; before the latter met the dark 

 blue its boundary was precipitated, showing that it had met a 

 colorless anion (probably tartrate) which traveled faster than 

 the complex copper-containing anion. 



1899. M. Mugdan. 



Zeit. f. Elektrochemie, 6, 309 (see A. Kendrick, 1900). 

 1899. W. Starck. 



Neue Beitrage zur Kenntnis der lonen verdiinnter Schwefelsaure. Zeit. phys. 

 Chem., 2g, 385. Auszug aus einer Greifswalder Dissert. 



Apparatus : (i) superposed glasses with parchment or earth- 

 enware diaphragms, (ii) three U-tubes connected by two si- 

 phons ; no diaphragms ; capacity 30-40 c.c. Middle portions 

 unchanged ; Pt electrodes ; method of calculation correct. 

 *' Diaphragms hold the cation"; Cf. Bein, **hold anions." 



HjSO^ 



