895 



lithium, wiiich is lighter, but also zinc more than cadmium, which 

 is heavier. 



Salt. 



Quantity 

 in mg. 



Quantity 

 in mol. 



Remarks. 



Li, SO4 1 aq. 

 Na2 SO4 10 aq. 

 Mg S04 7 aq. 

 3 Cd SO4 8 aq. 

 Zn SO4 1 aq. 

 AI2 (504)3 18 aq. 

 Cfj (504)3! 8 aq. 

 Fez (S04)3 



60.5 

 161.2 

 123.3 

 128.3 

 143.8 

 111.1 

 65.4 

 85.5 



Vjooo 



Veooo 

 '/2000 

 Veooo 



Colour of the bath 

 decreases as indi- 

 cated by arrow. 



Between Li and 

 Na there is a clear 

 difference. 



Coagulation of the 

 dyestuff inthe bath; 

 the fibre remains 

 colourless. 



Magnesium seems to form an exception in tiiis respect; however 

 it turned out that this metal should not be compared with Zn and 

 Cd, but with the alcaline earth metals, with which it shows more 

 resemblance, also in otfier respects, than with zinc and cadmium. 



Salt. 



Quantity 

 in mg. 



Quantity 

 in mol. 



Remarks. 



I Hg CI, I 

 Mg CI2 6 aq. 

 I Cd Clo 2 aq~l 

 Ca Clcj 6 aq. 

 Ba Ci2 2 aq. 



135.6 

 101.7 

 109.6 

 109.5 

 104.1 



/200D 



Colour of the bath 

 decreases as indi- 

 cated by the arrow. 



From this survey we have conclusive evidence that magnesium 

 belongs to the series Mg <[ (.-a <[ Ba of which it forms the least 

 strong term, whereas cadmium must be considered to be one of the 

 series Hg <^ Cd <^ Zn. 



In both series the most electropositive metals are the most effective. 



The series intersect and as magnesium is more electropositive than 

 cadmium and zinc, and yet extiacts less effectively, there must be 

 another property beside electroposilivity, which governs the extract- 

 ing action of the metal. 



II. 



With a view to confirming the results communicated in the 



58* 



