40 MEMOIRS OF THE NEW YORK BOTANICAL GARDEN. 



The epidermal cells were much longer and narrower than in the 

 normal, which was also true of the guard cells of the stomata. The 

 latter showed a narrow slit, and were slightly functional. The ex- 

 istence of the leaves covered only a few weeks. The exaggerated 

 length of the epidermal cells in this species is seen not to be accom- 

 panied by a corresponding increase in the measurement of the length 

 of the leaf, hence the number of epidermal cells developed must be 

 smaller than in the normal. The inflorescence axis failed of devel- 

 opment entirely. 



Amaryllis Johnsoni Bury. 



Awakening bulbs of Amaryllis Johnsonii placed in the dark 

 chamber in April, 1901, showed a fairly normal elongation of the 

 scape. The flowers opened in the usual manner with the pistil 

 extruded to a length of 2 cm. beyond the stamens. It is to be noted 

 that the unopened flower bud in this instance was subject to the 

 action of light for some time before growth began, and that ample 

 opportunity was afforded for the exercise of a stimulating effect. 



Amorphophallus Rivieri Dur. 



A large corm of Amorphophalltis Rivieri \N?iS placed in the dark 

 room in a resting condition in March, 1900. The soil was allowed 

 to become slightly drier than that necessary for germination until 

 September, 1900, when water was applied daily. The flower bud 

 opened in October and the scape began to elongate at a rate which 

 increased until it amounted to 20 cm. one day and 25 cm. on another, 

 after which the rate decreased to minimum. A total length of 1.8 

 meters was reached within three weeks. The three sheathing 

 scales at the base of the scape were 12,22 and 35 cm. in length, 

 which is much greater than that of the normal. The attainment of 

 full length of the scape was marked by the appearance of the roots 

 from the upper internode of the corm, these organs being entirely 

 dormant until this lime. 



The development of the scape and flower was accompanied by a 

 striking display of color. The scape was slightly fluted, pale red in 

 color with mottled patches of violet, and exuded sap freely when cut 

 across. The spathe was only slightly flaring at the top where it was 

 a deep rose purple, shading lighter to the base, where it was a pale 

 rose tint. The spathe reached a length of 40 cm. and the inner surface 

 of the lower portion was deeply rugose and purple for a distance of 



