- Ik . 



It originates by neoformation from the protoplasm, like the cyanoplasts 

 of the preceding species, and toward the end of its evolution, like these, 

 dissolving, the intense red color spreading through the cell sap (PI. XVIII, 

 fig. 9). 



In each cell one generally finds a single cyanoplast. They show an 

 involucre the cavity of which is occupied "by the coloring substance. The 

 involucre is made evident by treating ^e sections with oxygenated water or 

 with osmic acid and the colcring substance presents all the reacticns 

 characteristic of anthocyanine, since with water and alcchv-1 it dissolves 

 easily, with alkali it assumes a greenish yellovj color, with nicotine in dilute 

 aqueous solution it becomes green, and, finally, it decolorizes easily with 

 sulphurous anhydride or with oxygenated water. 



Erica carnea Linn. 

 In order to study the cyanoplasts of this species, it is necessary 

 to examine specially the calyx which, like the corolla, is colored rose 

 violet. Such coloration is due to a pigment which behaves like anthocyanine 

 and which forms in the cyanoplasts. They are relatively very large and are 

 generally found in numbers greater than one per cell (Pl. XVIII, fig, k) . 

 Their structure and their development resemble perfectly those of the 

 cyanoplasts of the preceding species. In the ultimate stages of their 

 evolution they show vacuolization; finally, they dissolve completely and 

 cause coloration of the cell sap, which at first was colorless (Pl. XVIII, 



fig. 6). 



Besides the cyanoplasts, one should note in this species the presence 

 of little spheres which are refractile to light (Pl. XVIII, fig. k) , which 

 one finds singlyCrarely more than one)per cell. They are in the epidennis 

 as well as in the parenchyma of the leaves, of the sepals, and of the petals. 



