84 Hill .— The Structure and Development of 
another when maturity is reached. The fruits of this plant 
are much stouter and shorter than are those of Triglochin 
palustre , L. 
ANATOMY. 
The existing accounts of the anatomy of Triglochin mariti- 
mum are very scanty. The only descriptions which have been 
found relating to the anatomy, taken as a whole, are embodied 
in an account by Chatin (3), which was published in 1862, and 
in a paper by Van Tieghem, published in ^870 (14 a ), the 
latter being mainly concerned with the structure of the root. 
These two papers are the principal sources of our informa¬ 
tion of the structure of the plant, and they leave much to be 
desired in the matter of completeness. Chatin, in the paper 
just referred to, gives a very short account of the general 
anatomy of Triglochin maritimum^ and adds a few remarks on 
that of Triglochin palustre. He gives very few details, and 
merely describes the general disposition of the tissues, briefly 
noting a few characters of each. In speaking of the root, he 
correctly states that spiral vessels are absent. 
Van Tieghem (14 a), in discussing the structure of the 
roots, states that the xylem-strands do not meet in the centre 
of the root, but are separated by parenchymatous cells ; the 
pericycle is described as a continuous layer, with the sieve-tube 
of each phloem-group abutting on it, and the companion-cell 
does not appear to have been noticed. These statements 
have not been verified in this investigation. Van Tieghem 
also calls attention to the fact that the lacunae in the inner 
cortex show signs of lysigenous development. 
THE RHIZOME. 
This organ may attain a considerable length ; how long, it is 
impossible to say exactly, for the rhizomes are very brittle, 
and the plant grows in a very heavy soil, so that it is extremely 
difficult to clear away the earth without breaking them ; pieces 
of rhizome, however, have been found as long as 7 cm. The 
root-stock is not very thick ; the older portions have a diameter 
