Stiles and Jergensen.—Studies in Permeability . I. 359 
calcium chloride and aluminium chloride. The kations of both these salts 
are generally regarded as comparatively harmless ions. The results obtained 
were similar to those obtained in the mixtures of lithium and potassium 
chloride, but the results were less rather than more marked. It should be 
quantities of Al Cl 3 The ratios are cjiren in terms of normal, not molecular solutions 
noted that the strengths of calcium and aluminium chlorides are given in 
normal, not molecular concentration. Practically identical results are obtained 
in all these cases when molecular ratios are used instead of normal ones. 
Series 8-u. The antagonistic action of aluminium chloride on copper 
sulphate had been made the subject of a very interesting investigation of 
Szucs ( 25 ). In order to see whether any similar results would be indicated 
c 
. a 
4C 
3 
O 
"5 
Potato Cu SO/}, solutions to which 
various) quantities of Al. Cl^ have been added, 
by this electrical conductivity method, the effects of mixtures of copper 
N 
sulphate - with different quantities of aluminium chloride were examined 
1000 
with potato tissue. The relative quantities of CuS 0 4 to A 1 C 1 3 in the 
different solutions were I : o, i : i, i : 2, i : 4, and 1 : 6. During the first 
