IO4 VEGETABLE SUBSTANCES. 



PHYCOCHROMIN (Sachsse = Na'geli's phycochrome 

 chlorophyll) 



Is a pigment which occurs in connection with 

 chlorophyll in the bluish-green algae. It is soluble 

 in water, but insoluble in alcohol, and probably 

 consists of . phycocyanin (Sachsse x ), and a variable 

 quantity of phycoerythrin (Kiitzing). Cells which 

 contain phycochrome are colored yellowish-green 

 or yellowish - brown by alkalies, and orange or 

 brick-red by hydrochloric acid. 



PALMELLIN (Phipson2) 



Is the red pigment found in Porphyridium cruen- 

 tum Naeg. It is soluble in water. The addition 

 of alcohol, acetic acid or alkalies to this solution 

 causes a flocculent precipitate, while the fluid 

 assumes a blue color. Ammonium sulphide colors 

 it yellow without forming a precipitate. 



PHYCOXANTHIN (Millardet, Askenasy) 

 Is the yellow coloring matter of diatoms and 

 Fucaceae, and is more readily soluble in alcohol 

 than chlorophyll is. In the diatoms it forms, with 

 chlorophyll, the yellowish-brown endochrome 



1 Kiitzing's phycocyanin is the coloring matter of Oscillarise, which is 

 soluble in water. 



2 Comptes rendus, Aug. 1879, p. 316. Schnetzler: Bull, de la Soc. 

 vaudoise des Sc. nat.. 2. Ser., Vol. XV. 



