FOLIAGE-LEAVES AND THE CHLOROPHYLL FUNCTION. 533 
in a dark chamber. If the leaves were removed, no changes 
resulted in the development of the scape or spathe. The latter 
organ was dwarfed as usual, although not more than 30 em. from 
the stored food in the corm. If the scape and one leaf were 
removed from a plant emerging from the bud in a dark chamber, 
the remaining leaf exhibited a development quite similar to those 
of entire plants under similar circumstances, except that the 
petiole reached a length much in excess of those on an entire 
plant. The lamine were extended in such manner as to cause 
the disappearance of the angles of the leaf-folding in the bud. 
They soon became recurved at the margins, and only a small 
increase in size occurred after unfolding. 
The removal of one leaf and the scape from plants grown in 
an air free from CO, resulted in a somewhat more complete 
development of the lamine than in an entire plant under the 
same circumstances. The angles taken on in the bud com- 
pletely disappeared; an approximately normal green colour, 
and a position quite similar to that of plants in free air, were 
assumed. The amount of food available for development must 
have been two or three times as great as that usually afforded a 
single leaf. In 12 to 14 days, however, the lamine began to 
exhibit signs of deterioration; but if at this time they were 
removed from the apparatus and placed in the open air a normal 
condition was restored, and development proceeded in the usual 
manner (see Plate XIX. fig. 4). 
Comment.—The leaves on an entire plant of Arisema are 
incapable of development beyond the unfolding stage in an 
atmosphere free from CO,. If two of the three aerial members 
are removed, the remaining one may attain a more advanced 
stage of development. In darkness the petioles are greatly 
elongated, and unfolding of the laminæ takes place, but no 
expansion of their area ensues. The removal of concurrent 
members results in an exaggerated extension of the petiole, but 
has no effect on the laminæ. A similar result is obtained with 
the spathe under both conditions. It is to be noted that in light 
the removal of concurrent organs results in an increased 
development of the laminæ, and in darkness of the petiole. 
Oxalis floribunda, Lehm., and O. vespertilionis, Zuce. 
The first-named species was furnished with a tuberous rhizome, 
1 to 2 em. in diameter and 2 to 4 em. in length, densely charged 
