358 



Mr. E. Schunck. 



Phyllocyanin argentic acetate. 



zinc acetate. 



„ palmitate. 



,, ,, stearate. 



,, oleate. 



,, „ citrate. 



„ ferrous acetate. 



,, palmitate. 



,, „ oleate. 



,, „ citrate. 



malate. 

 phosphate. 



„ manganese acetate. 

 It would, of course, be easy to extend this list by taking a greater 

 variety of acids and metallic oxides. 



Nevertheless, strange to say, several compounds, the existence of 

 which might have been anticipated, are not formed under the same 

 conditions as those above enumerated. Phyllocyanin does not enter 

 into combination when its alcoholic solution is boiled with cupric 

 oxide and oxalic acid, zinc oxide and oxalic acid, zinc oxide and 

 tartaric acid, ferrous oxide and tartaric acid. I could also see no in- 

 dication of double compounds of phyllocyanin hydrochloride with 

 the chlorides of platinum, mercury, or copper being formed, but on 

 the other hand, a double sulphate of phyllocyanin and copper seems 

 to exist. Attempts to form compounds by heating mixtures of 

 phyllocyanin with glycerin and various fatty acids, at a temperature 

 of 130°, led to negative results. 



The various compounds above enumerated have a number of pro- 

 perties in common, though the several classes differ, inter se, in some 

 important particulars. 



They all dissolve more or less easily in alcohol, ether, chloroform, 

 benzol and carbon disulphide, in fact in all the solvents which take 

 up phyllocyanin and chlorophyll, but they are all insoluble in water, 

 with the exception of the phyllocyanin manganese acetate, which 

 dissolves readily therein. The solutions have a green colour, varying 

 from grass-green, like that of chlorophyll solutions, to a fine bluish- 

 green or blue, and they show peculiar spectra. The alcoholic solu- 

 tions remain quite unchanged when sulphuretted hydrogen is passed 

 through them, no precipitate is formed, and the solutions, on 

 evaporation, leave the various compounds with their original proper- 

 ties unchanged. It is only on incineration that the presence of the 

 metallic constituents is detected, the copper compounds leaving, after 

 being burnt, cupric oxide ; the zinc compounds, zinc oxide, the iron 

 compounds, ferric oxide. Lastly, they are all soluble in dilute alkaline 

 lyes, and are again precipitated unchanged on the addition of acetic 



