46 McBAIN [1900 Kendrick 



The values calculated from Pb and PbOj electrode cells are 

 supplemented by corresponding values calculated from the 

 measurements of Mugdan (1899, Zeit. f. Electrochemie, (5, 316) 

 which are given in the third column below. 



1901. H. T. Calvert. 



Ueber die Alkalisalze des Hydroperoxyds in wiissriger Losung. Zeit. phys. 

 Chem., j<?, 535. Zeit. f. Elektrochem., 7, 624. 



In the bottom of a U-tube was placed the solidified solution 

 obtained by diluting a saturated potassium nitrate solution seven- 

 fold with 2 percent agar agar solution and adding 8 percent 

 (volume) of a normal sodium hydroxide solution which had been 

 saturated with lead oxide. Above this on both sides of the 

 U-tube was placed a layer i cm. deep of the same solution with- 

 out the addition of plumbite. The rest of the tube was filled 

 with a solution ^ m. in respect to NaOH, i.o m. in respect to 

 HjOg. The specific conductivity was the same throughout the 

 tube, the temperature was 0° C. On passing a current through, 

 a brown ring of lead superoxide was formed in the lozvcr agar 

 agar solution at the boundary on the cathode side, and another 

 in the aqueous solution at the boundary on the anode side. 

 Reversing the current reversed the phenomena. Although the 

 author does not discuss the possibility of cataphoresis the resul- 

 tant difference of 2 cm. in hydrostatic level on the two sides 

 (which would be necessary to explain the results on this suppo- 

 sition) could not escape observation, and thus the experiment 

 demonstrates the migration of a peroxide ion. 



igoi. R. Gans. 



Ueber die Abhangigkeit der elektrolytischen Ueberfuhrung und der elektro- 

 motorischen Kraft reversibler Elemente von physikalischen Einfliissen. Drude's 

 Ann., 6, 315. 



From his measurements of the E.M.F. of the concentration 

 cell Zn/0.4 m. ZnSO^/0.04 m. ZnSO^/Zn the author deduces 

 the formula n = 0.699 (^ + 0.00012 ^) to represent the effect of 



