COLORING MATTERS. 99 



COLORING MATTERS. 1 



A. Of Protoplasm. 



CHLOROPHYLL (Leaf Green) 



Is a green substance which is insoluble in water, 

 dilute acids, and alkalies, but soluble in ether, 

 benzole and alcohol. It is bleached by Labar- 

 raque's solution. When treated with dilute acids 

 it assumes a yellowish color, while concentrated 

 hydrochloric and sulphuric acids change it to a 

 bluish-green or blue. 2 



Methyl green (p. 63) colors chlorophyll bodies a 

 more intense green, and by prolonged treatment 

 with hydrochloric acid masses of hypochlorin may 

 be extracted from them. 



According to Pringsheim, the following pigments 

 may be regarded as modifications of chlorophyll : 



a. ETIOLIN, 



The yellow matter of etiolated plants, which is 

 soluble in alcohol and ether, but insoluble in water. 

 Its solution is colored emerald or verdigris green, 



1 Nageli : Das Mikroskop, 1877, p. 528. C/., further, the literature of 

 vegetable coloring matters, sitfra, p. xviii. 



2 Cf. Bommer: Bull, de la Soc. bot. de France, 1873, Session extraordi- 

 naire. 



