COLORING MATTERS. IOI 



d. FLORIDEA-GREEN (Pringsheim). 



The chlorophyll of Florideae, which gives the 

 same chemical reactions as the true chlorophyll of 

 higher plants, is to be regarded, according to 

 Pringsheim, as a variety of this, on account of its 

 optical properties. 



e. FLORIDEA-RED (Phycoerythrin, Kiitzing, Cohn) 



Is soluble in water, by which it may be removed 

 from the dead plasma-bodies. When allowed to 

 stand in the light, exposed to the air, it fades, and 

 the same effect is produced when it is treated with 

 potassic hydrate. Sulphuric acid does not change 

 the color. 1 



HYPOCHLORIN.2 



After chlorophyll grains have been treated for 

 some hours with hydrochloric acid a substance 

 separates from them, appearing either as a crystal- 



1 Nageli and Schwendener (Mikroskop, 1867, p. 498) understand by 

 " Floridea-Red " the entire coloring mass of the Florideae, chlorophyll- 

 phycoerythrin. Sachsse used the name in Kiitzing's sense, as we do. Kiit- 

 zing's phycohaematin from Rhytiphloea tinctoria, which needs further in- 

 vestigation, is omitted here. 



NOTE. To distinguish the colors which have been mentioned, properly, 

 they must be investigated by the spectroscope. Cf. R. Sachsse : Farbstoffe, 

 Kohlenhydrate and Proteinsubstanzen, Leipzig, 1877. 



2 Pringsheim : Untersuchungen iiber Chlorophyll, IV., Das Hypochlorin 

 und die Bedingungen seiner Entstehung in der Pflanze. Monatsber. d. 

 berl. Akad., Nov. 1879. (/ ibid., July 1879; also Comptes rendus, Jan. 

 1880, p. 161.); Jahrb. f. wiss. Bot., 1882, XIII. A. Hansen : Assimilation 

 und Chlorophyllf unction, 1882. 



