-ii- 



Their azure blue Jjigment shows all the react xcns cf anthccyanine , 

 since with acids it colors violet, with alkali it "becomes greenish yellow, 

 and with nicotine green; it dissolves, finally, in alcchcl and in slightly 

 acidulated water. Thus in this species one may demonstrate easily, treating 

 the sections with oxygenated water, that the cyancplasts prssess an invrlucre 

 which encloses the pigment alluded to. 



Iris f ixabriata Vent. 



In Iris f imbriata cne finds the cyanoplasts in the epidermal cells 

 of the ovary and at the basal part of the petals in open flowers. 



The cyancplasts are here larger (Pl- XVII, fig, 6), in exact relation 

 to the development cf the cell, and they present an involucre which becomes 

 evident whenever cne uses methcds ab'.ve indicated. 



It is a notable fact that the cyanrplasts in this species may appear 

 in complete development, colorless, colored in varying degrees of intensity. 

 In these ccl'":rless bodies, by the use rf salts of ir^n, bichromate cf pctash, 

 osmic acid, and methylene blue, the presence cf tannin may be easily establish*: 

 ed, and, in others, applying suitable reagents, cne may demonstrate the fact 

 that their pigment belongs to anthocyanine , 



Clerodendron Balfour i Hort. 



The pigment to which is due the coloration of the red corolla of this 

 species is, generally, in open flowers, dissolved in the cell sap. 



However, he who examines many flowers will conclude that the origin 

 of this pigment is like that cf anthocyanine hitherto alluded tc. 



In fact, in not infrequent cases is to be fciind, immersed in the cyto- 

 plasm, a red spherical body (Pl. XVIII, fig. 7), in the cell in which the cell 

 sap is perfectly colorless. This body represents the cyancplast. 



