86 MEMOIRS OF THE NEW YORK BOTANICAL GARDEN. 



It is to be seen that Caladium is capable of making a sustained 

 effort to carry its chlorophyl surfaces up to light by means of the 

 comparatively enormous amount of energy stored up in its large 

 corms. A second series of cultures gave approximately similar re- 

 sults, and the behavior of this plant is much like that of Arodes, to 

 which it is closely similar in form and development. 



Fig. 42. Epidermis of petioles of Crt/a</?«;M esc/z/t^w/ww. ^, normal. .6, etiolated. 



Calla (cultivated). 



Large corms of Arodes ( Calla Aethiopica) placed in the dark 

 chamber in November developed two large leaves and a flower stalk 

 within a month. The flower did not reach the advanced stages of 

 Arisaema^ and the spathe remained tightly wrapped about the spadix. 

 The leaves quickly died down, and a succession of these organs was 

 formed continuously with no apparent resting period for nearly a year, 

 when, the corm being nearly exhausted, death ensued. The leaves 

 showed some chlorophyl under the conditions in which most of the 

 species examined were entirely blanched, except the ferns (Fig. 40). 



The following comparative analyses of the aerial organs were 



made ; 



Etiolated Laminae and Petiole. 



Weight of fresh inaterial 5-5 20 



" " dried " .399 



" " ash, .027 



Percentage of water 92-77 



" " dried matter 7.23 



" " ash in fresh material .049 



u 41 u ci dried " 6.76 



Normal Lamina and Petiole. 



Weight of fresh material 4.290 



" " dried " .440 



" " ash, .031 



