v.] REMARKABLE LEAVES, 89 
flower, or to the same flower a second time, and is 
pushed by its comrades into the bucket, and then 
crawls out by the passage, the pollen mass _neces- 
sarily comes first into contact with the viscid stigma, 
and adheres to it, and the flower is fertilised. Now 
at last we see the full use of every part of the flower, 
of the water-secreting horns, of the bucket half full 
of water, which prevents the bees from flying away, 
and forces them to crawl out through the spout, and 
rub against the properly-placed viscid pollen masses 
and the viscid stigma.’—Ovrzgin of Species. 
One smail group of orchids (Ca/eana), confined to 
New Holland, possess an irritable lip, which, in fine 
weather, bends back, and leaves the column un- 
covered and open to the insects; but if it rains the 
drops cause the irritable lip to close up over the 
column, which is thus effectually secured from rain. 
Similar phenomena occur in Drakea and Spiculea, 
other species of orchids. 
We must now take leave of this interesting group 
of plants, and again pay some slight attention to 
peculiar leaves. One of the most remarkable of 
these is the Lattice-leaf (Ouvirandra fenestralis), a 
native of Madagascar. It is an aquatic plant, pos- 
sessing tuberculate roots and submerged leaves. For 
our acquaintance with it we are indebted to the well- 
known missionary, the Rev. W. Ellis. The remark- 
able portion of the plant is the leaf, which at first 
sight looks like a mere skeleton-leaf—one that has 
had all the cellular tissue cleaned off the fibres—with 
open spaces between the nerves or fibres. But the 
miscroscope shows us that the fibres are really en- 
