Explanation of Figures. 



1-10. Different stages of the formation of antbocyan in the petaloid calyx 

 of the red Japanese Hortense, approximately in natural size. 



1. Young state of the flower. 



2. A little later stage of the flower. 



3. 4, 5. Progressive appearance of anthocyan from the peripheral end of 



the calyx in a centripetal way. 



6. Bed colouration of the upper side of the calyx, with the exception 

 of some overlapped parts and immediate vicinity of the veins. 

 Most of the flowers begin to nutate at stages of figs. 5-6. 



7. The lower side of the calyx of a somewhat dull red colour. 



8. The same (only one leaf), much more advanced. 



9. The upper side of the calyx, on which red anthocyan has only 

 slightly develo[)ed hut which has been remarkably reddened on 

 the mechanically injured parts. 



10. Maximum degree of anthocyan development on the lower side. 

 11 Cross-section of the calyx-leaf at a little later stage than that 



in fig. 2. X 420. 



ep. Epidermal cells enclosing protanthocyan. 

 c. Crystals of calcium oxalate found in intercellular air-spaces 

 of hypodermal parts. 



12. Ditto, in the same stage as that in fig. 8, showing the fully de- 

 veloped state of anthocyan on the upper antl the lower side, x 325. 

 ch. Well formed chlorophyll-grains. 



V. c. Bluish violet crystals of anthocyan. 



13. Epidermal cells of the upper side of the same, strongly magnified, 

 showing their minute contents, x 925. 



n. Nucleus. 



rg. Refractive globules. 



14. Epidermal and hy[)odermal cells of the upper side of the same. 

 X 925. 



V. c. Violet crystals. 

 ch. Chlorophyll-grains. 



