Trigiockin maritimtim , L. 93 
In the paper referred to he describes their form and 
arrangement. Similar structures occur in other natural 
orders, e. g. Hydrocharidaceae and Callitrichaceae (see 
Caspary, 2 , and Hegdmaier, 9 .) 
At the base of each glandular body there is seen, in 
longitudinal section (Figs. 10 and 11), a layer of cells, 
thickened in much the same manner as an endodermis. This 
layer of endodermoid cells is continuous across the plane of 
attachment of the gland, and is not found elsewhere. 
The thickenings are somewhat difficult to make out in 
the very young glands, but with advancing age the thicken¬ 
ings increase considerably until they are as represented in 
Fig. 11; so that when the gland is no longer necessary to 
the plant and drops off, the part of the cortex with which 
it was in contact is fully protected. This very interesting 
fact does not appear to have been noticed by earlier 
observers. 
In connexion with the cutting off of these glands by the 
development of a special tissue, it is interesting to note that 
Miss E. Dale ( 5 ) has found that a somewhat analogous 
process obtains in the intumescences situated upon the stem 
of Hibiscus vitifolius , the outgrowths being there cut off by 
cork, which arises in the lowest row of daughter-cells derived 
from the original epidermis. 
The secretion of these glands appears to be mucilaginous. 
They are stained pink with corallin-soda, and blue with 
aniline blue, although these reactions were not so well 
marked as those obtained with the glands of Rumex , which 
were tested at the same time and with the same reagents. 
Oils and tannin appear to be absent, for no reactions took 
place when they were treated with osmic acid, chromic acid, 
potassium bichromate, and ferrous sulphate and nitric acid. 
The Root. 
The roots of Triglochin are adventitious, and arise acro- 
petally from the rhizome; they are very numerous, and may 
attain a length of 10 to 11 cm., with a diameter of about 1 mm. 
