ANTHOCYANINS AND GENETICS 



201 



Substance added to soil 



Iron oxide (Hammerschlag) 



Fe 3 4 

 Moor soil (from Wittingau 



in Bohemia) 

 Heath soil (from Cibulka 



near Prague) 



Peat 



Aluminium oxide, A1 2 O 3 ... 



Iron filings 



Iron shavings 

 Iron tacks ... 



Ochre 



Granulated zinc ... 

 Tin foil (clippings) 

 Charcoal 

 Emery powder 

 Powdered slate 



Powdered sulphur 

 Soda 



Lime 



Ferric chloride 



Potassium sulphate 

 Ammonium sulphate 

 Manganese sulphate 

 Copper sulphate ... 



Colour of flowers 



Two plants bluish, the 



rest red 

 Blue 



Red, with blue filaments 

 All red 



All red 



Nickel sulphate ... 



Cobalt sulphate ... 

 Zinc sulphate 

 Potassium carbonate 



Remarks 



Plants strong and flowers 

 large 



Some tendency to become 

 blue in filaments and 

 fruiting flowers 



Leaves died in most cases 

 after a week: plants 

 weakly 



Used in too large quan- 

 tity 



Leaves tended to fall off 



Leaves became brown 

 Only one plant: red 

 flowers 



Substance very poison- 

 ous: plants died 



Molisch found the filaments of the stamens very sensitive to the 

 substance added, and notes that if one is in doubt as to whether any 

 effect has taken place, one should examine these organs. In the case of 

 alum, it is evidently the aluminium salt which is effective, since potas- 

 sium sulphate produces no blue colour by itself. Aluminium sulphate 

 alone, moreover, produced the most intense blue colour. Aluminium 

 oxide has no effect on account of its insolubility, whereas in the slate 

 there must be some slightly soluble iron or aluminium compound. From 

 his researches Molisch draws the conclusion " dass Alaun, schwefelsaure 



