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of the basal half of the leaf. For the rest the outside of the calyx, 
as also the leaf and the peduncle are covered with long hairs, which 
from a broad base, run out into a point, are generally composed of 
4 cells and have a highly refractive content; these hairs are especially 
numerous on the upper surface and are more or less limited on the 
. under surface to the course of the veins. 
Now if a cut young plant is placed for a few hours in a moist 
space, numerous droplets are secreted on the leaf especially on the 
basal portion; by the running together of these drops the leaves are 
soon covered with a layer of water. Such waterdrops appear at the 
same time on the outside of the young flowerbuds. The secretion 
of water is only absent from the very youngest leaves of the bud, 
but instead a mucilage-secretion takes place from the walls of the glands. 
The waterglands of Datura are therefore originally mucilage-glands 
(Trichomzotten) which afterwards secrete water. 
The long, erect, conical trichomes do not take part in the secretion 
of water. Not infrequently, however, a clear drop of mucilage is 
found on some of these hairs, on the apical cell or on one of the 
other cells. 
Nicandra physaloides Gartn. 
As was already shown by Koorders the water-secretion of Nicandra 
physaloides agrees with that of Spathodea carnpanulata and of other 
plants in as much as the water-secreting trichomes are here 
also found on the inner surface of .the calyx, and the secretion 
already begins when the other floral organs have scarcely been laid 
down. The plants grown here do not secrete any less than at Buiten- 
zorg; the young buds are generally completely filled Avith water. 
Koorders has already mentioned, that club-like trichomes, similar 
to those secreting the water on the inner surface of the calyx, are 
also found in almost as great numbers on the outside of the calyx 
and of the corolla. 
I now add, that the young leaves also, from the earliest bud-stages 
onwards, are covered on either side with these trichomes, and that, 
as in Datura, they are afterwards found especially in large numbers 
on the basal half of the leaf. 
In Nicandra also they are laid down very early; the very young 
leaflets of the bud, of no greater length than 1 mm., are already 
thickly covered with them. Likewise they are found to be originally 
mucilage-glands. 
Nicandra further agrees with Datura in this respect, that the 
leaves but here only on their upper surface — bear large conical 
