ANTHOCYAN IN THE PEÏALOID CALYX. 



11 



differs greatly from that of the autumnal red colouration 

 of leaves. 



Crystals of calcium oxalate decrease still more than in the 

 preceding ])hase. Some raphides are rarely found in the middle 

 part of the mesophyll layer. 



Chlorophyll-grains begin to appear, at first, in both hypo- 

 dermal cells and later extend toward the middle of the mesophyll. 

 The formation of starch, accompanying the chlorophyll-grains, is 

 soon afterwards observed. That chlorophyll-grains appear later 

 than red anthocyan has been noticed by former investigators^^ in 

 many cases, and this fact is no doubt to be explained from a 

 teleological point of view. 



The chemical reactions of dee[) red and blue anthocyans are 

 Liiven in Table III. 



Table III. 



1) Pick, Bedeutung des rothen Farbstoffs bei Phanerogamen. (Bot. Cent. Blatt. Bd. 16. 

 p. 2S], 1883). Kerner, Plkmzen Leben. 2. AuH. Bd. I. p. -170, Stahl, fAnnales du Jardin 

 Butaniipic de Buitenzorg. Vul. XIII. p. 137-216, ISUti). "*■■"■ ' 



