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■1 Following the metamorphosis a'bove referred to, we come to the color- 

 ing substance of the cyanoplasts, diffusing it into the ceil oavity subse- 

 quent to the shrinkage and rupture of their involucre. This [the involucre 3 

 finally disappears completely and the cell sap, which at first was perfectly 

 colorless, little by little, as the cyanoplast degenerates, tates on at first 

 a pale blue color, then becomes intensely blue. 



Origin and biolog ic significance . In the protoplast, as hais been noted 

 one finds organs diverse as to constitution, structure, and functional value 

 or worth, some of which arise from preexisting organs; others, on the contrary, 

 originate directly from the protoplast by neoformation. Anong these latter, 

 as one may deduct from the history of their development above described, is 

 the cyanoplast. 



, As to the appearance of the pigment, it may be said that it coincides 

 generally with that of the cyanctolast. There are cases, however, in which 

 the latter shows complete development independent of its pigment. Thus, for 

 example, examining the flowers of the little plant which I found in an ob- 

 scure comer of the greenhouse (-under conditions of hutnidity and temperature 

 differing from those of the majority <?f speciments examined by me) and in 

 which only the apical parts of the pale petals showed azure blue color, I 

 'observed that in the margins, and especially toward the apex, some, among the 

 numerous cyanoplasts, were completely developed and colorless (Pl. XVI, fig, 

 1); others, on the contrary, were developed but intensely azure blue in color; 

 and, finally, still others showed diverse intensity of color. 



In this case, then.tlie gradioal transformation in the anthocyanine may 

 be assisted by a substance already extant within the cyanoplast throtigh 

 metabolic processes which take pl^ce within the same. 



