( 320 ) 
confirmed to the extent that, Haberlandt noticed a formation of 
drops on the leaf-teeth. 
I myself have, no more than Nestler, been able to distinguish 
with certainty the formation of droplets on the leaf-teeth. 
The latter bear at their apex a single pore with a large opening, 
which leads to a relatively small cavity filled with fluid, below which 
the epithema is situated. Of this tissue Haberlandt has given a very 
detailed description and some figures. 
As regards the structure of the bud, Reinke already pointed out 
that at the base .of each leaf there are two small aeicular stipules, 
which broaden out at the base, and secrete much mucilage with 
which the youngest parts of the bud are completely surrounded. 
Speaking generally, these are again completely simular to the 
tops of the leaf-teeth of Kerria and the cells of which they are 
composed, are- distinguished by their highly refractive contents. In 
addition the lower surface of the young leaves in the bud is thickly 
covered with thin walled trichomes which have a broad club-shaped 
end and are already formed when the leaves are still extremely 
minute. 
Here and there the same hairs occur also on the upper surface of 
young leaves, especially on the basal portions and they are further 
found in large numbers on the young flowerbuds and stalks. 
For the rest the upper surface of the leaf bears somewhat longer 
pointed hairs with thicker walls and a cuticle with markings. 
If a cut plant is placed under the moist bell-jar, the phenomenon 
to which Gardiner drew attention, is soon observed i. e. the upper 
and especially the under surfaces of the young leaves appear bedewed 
with numerous fine droplets. 
This phenomenon is brought about by the vigorous secretion of 
the numerous club-shaped hairs referred to above; each of these 
bears at its end a droplet of water, thus showing itself to be a 
water-gland, this secretion may be so copious, that the lowei 
surface of the leaf is soon (on the 2“ d or 3 rd day) covered with a 
layer of water. 
The same may be observed on the young flowerbuds; these are 
soon surrounded by as many hundreds of small clear waterdrops 
as there are glands which have found a place on the surface. 
It follows from the above, that in considering the secretion of water 
on the surface of the plant, we must not only take into account , e 
formation of drops which result directly from root-pressure, but 
