Aî^HOCYAN IN THE PETALOID CALYX. 



Looking over the table it will be seen, in general, that acids 

 do not produce any marked change in the colour of the red 

 anthocyan but that alkalis change it into green. The presence 

 of sugar in the mesophyll layer remains doubtful. Chlorophyll- 

 grains have not yet nppeared. 



The Third Phase. 



Duration of observation : July 20 — August 1. 



External form. — The majority of the flowers of red Hortense 

 now tend to nutate around their stalks, though some of them are 

 not yet wholly reddened on the upper side of the calyx. Each 

 calyx-leaf becomes turned upside down. This process which is 



