408 RENNERT: THE PHYLLODES OF OXYPOLIS FILIFORMIS 
clusion that the conservation of water is the chief purpose met by 
the striking structural adaptations. 
This view is strengthened by the experimental results. Two 
series of cultural tests were made. In one series a number of 
plants in pots of soil were enclosed in bell-jars and were thus grown 
in a saturated atmosphere. Others were entirely submerged in 
Fic. 2. Partial cross-section of phyllode, xerophytic form, 140. 
tanks of water. The phyllodes produced under these conditions 
were similar. In both cases these organs were delicate, hollow, 
terete, translucent, light green in color, and exhibited no trace of 
glands or pits. The stipules were membranous and reduced in 
width. The epidermal cells were without wax or cuticle and were 
greatly elongated longitudinally. The stomata were partly ex- 
serted and were of a reduced number, but retained their character- 
istic structure. In consequence of the regularity of the epidermal 
