640 



In mass the crystalls appear to be coloured dark brownish red 

 violet, but single crystalls observed through a magnifving glass 

 possess a brownish colour. The solution in Chloroform shows a cherrv 

 red colour and does not fluoresc. Concentrated solutions cause in 

 the spectrum three bands. and more diluted ones four, the position 

 of which corresponds to the following wave lengths: 



Band I: À — 642 — 640 

 „ II: / — 606— 581 

 „ III: X — 577 — 557 

 „ IV: / — 536 — 515 



The first band is very indistinct, faint and narrow and plainly 

 visible onlv in more concentrated solutions. The second and third 

 bands imite in concentrated solutions, in more diluted the second 

 is placed on the D line and appears broader but fainter than the 

 tbird band. Lastly tbe fourth, behind the E line is still fainter 

 than the second band. According to thcir intensities these bands 

 mav be placed therefore in the fnllowing order: 



III. II. IV. I. 



Scatocyanin Schunck's causes in ehloroformic solutions five bands 

 „almost identical with those of phylloevanin". and differs therefore 

 very considerably from plivlloerythrine. 



The absorption sjiectrum of acetic acid solutions of phvlloery- 

 thrine does not differ very considerably from that of ehloroformic 

 solutions. The first band however which appears already faint in the 

 latter solutions is still fainter. scarcely noticeable in acetic acid 

 solutions. The second and third bands oecupy nearly the same 

 positions in both cases, but they do not differ so markedly as 

 regards the intensity. and the third band bas a very distinct sha- 

 dow on the more refrangible aide. The fourth band in the green 

 part of the spectrum differs but little from the corresponding band 

 shown by the ehloroformic solution. In wave lengths the positions 

 of these bands mav be expressed as follows: 



