( 311 ) 
found that the sec 
branches placed u 
with root-bearing 
d the same result from his experiment 
n of water from the glands on the leaves o 
£ maritbna took place equally well with cu 
a bell-jar, with the cut surface in water, a 
ts. He suggested that many of Haberlandt 
He 
the 
luch 
these of . 
plants might have behaved 
Stands of Phmeolus muliiflorus correspond closel; 
of Bignonia brasiliensis, Spathodea campanulat< 
us integrifolia correspond to the glanc 
the 
and those 
of Fiperom 
of Glaux maritima. . 
It will be shown below that this suggestion was perfectly legi¬ 
timate In my own investigations I have found so many plants which 
have epidermal glands which are independent of root-pressure that 
I do not hesitate to express the conviction that this is the general rule. 
Investigation has also shown me, however, that such water-glands 
which secrete a more or less mucilaginous fluid, are much more 
common in plants than has hitherto been supposed — especially m 
the younger parts. - and that in arriving at a conception of the 
process of water-secretion we must in the first place take into 
account these ever-functioning epidermal glands. 
Thus I have observed a secretion of water on the leaves of: 
FhUadelphus coronarim , Hydrangea pubescens , Hydrangea campanu¬ 
la, Weigelia rosea, Deutzia crenata, Corylus Avellana, Uhnuscam- 
pestris, Sambucus nigra, Syringa vulgaris, Forsythia viridissima. 
Fuchsia spec., Calystegia septum, Datura Stramonium, Nicandra 
physaloides, Cosmos hybruins, Dahlia variabilis, Melandrmm album, 
Thymus Serpyllum, Malva silvestrk, Sidalcea Candida, Abutilon 
Daminii, Abutilon Avicennae, most of which will be further con¬ 
sidered below. 
First, however, it may be as well to point out that we may 
deduce from Reinke’s paper in Pringsbeim’s Jahrbiicher of 1876') 
on the histological structure of so-called secretion-organs, occurring 
on leaves, that Reinke had already observed that the exudation of 
drops of water at the apex or the teeth of the margin of leaves 
may be a result of glandular activity. 
Reinke’s paper is a continuation of Hanstein’s investigation of 
resin- and mucilage-secreting structures in buds, which was published 
l ) Reinke, J, Beitrage zur Anatomie der an Laubblattem, besonders an den 
Zahnen derselben vorkommenden Seeretionsorgone. Pringsheim’s Jahrb. Vol. X. 
1876 p. 119. 
