936 ARUM MACULATUM AND ITS CROSS-FERTILIZATION. 
one another, and all of a greenish colour bluntly pointed. The 
tips of one pair sometimes appear a little above the ground, while 
the other two are generally an inch or so below. The leaves are 
smooth and shining, of a dark green colour, and always more or 
and plain leaves as proving the existence of two species, but this 
character is of no specific value whatever. 
; ave not been able to observe any particular conditions under 
which the plants usually produce either spotted or plain leaves, and 
do not at all know to resi to attribute the difference. In the neigh- 
often bear a greater or less resemblance to one another in the manner 
of their spotting, for there is as great variety in the nature and 
appearance of the spots as in their number and intensity. We 
have sometimes thought that the spotted leaves are rather later in 
appearing than the plain ones, but this may not be so. Spots 
certainly are not in any way a mark of the age of the plant. Dr. 
Bromfield writes, ‘In this island I can perceive no difference in 
the time of flowering, and the leaves of both are alike variable in 
size and shape. The spotted form would appear to be rarer towards 
en a 
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indent but not to go right through. In many cases these hollows 
were more than half as.deep as they were broad. In such speci: 
