L. A. Boodle. 
39 
Just. Cohn Beitrage z. Biologie d. Pflanzeu II. 1877. 
Parmer. Proc. Roy. Soc. Vol. 66, 1900. 
Macfadyen. Proc. Roy, Soc. Vol. 71, 1902. 
Friedel. Comptes Rendus T. 132, p. 1138, 1901. 
Friedel. Comptes Rendus T. 133, p. 840, 1901. 
Harroy. Comptes Rendus T. 133, p. 890, 1901. 
Herzog. Zeits. f. physiolog. Chemie Bd. XXX. 1902. 
Macckiati. Rev. gen. de Bot. T. XV. 1903. See also Bot. Ceutr. Bd XCV., 
p. 42, 1904. 
Beyerinck. Koninkl. Akad. v. Wetensch, Amsterdam, Proc. Sect. Sci. 
Vol. IV., 1901. 
Moliscli. Bot. Zeit. Jan. 1904. 
Ewart. Journal Linn. Soc. XXXI. 1896. 
SUCCULENT LEAVES IN THE WALL-FLOWER 
( 1 CHEIRANTHUS CHEIRI, L.). 
By L. A. Boodle. 
[With Fig. 62.] 
A MONG the characters of maritime plants, a common one is 
the possession of succulent leaves. This is to be found 
among species which only grow near the sea, and also in numerous 
maritime forms or varieties of inland species. 
Lesage 1 investigated a considerable number of plants and found 
that for the majority of them the leaves were thicker in specimens 
from a maritime situation than they were in plants living inland. 
His results on the structure of the leaves were as follows. In a 
plant growing by the sea, as compared with the inland form of the 
same species, if the thickness of the leaf is much increased, the 
palisade-cells are greatly elongated, the intercellular spaces are 
reduced and the chlorophyll tends to be less abundant. Lesage 
further determined that fleshiness, increased development of palisade, 
reduction of intercellular spaces and diminution of chlorophyll may 
be brought about in cultural experiments by watering plants (inland 
forms) with diluted sea-water ora solution of sodium chloride or by 
adding salt to the soil. 2 He subsequently proved by chemical tests 
in the case of specimens of two species, which had been watered 
1 Lesage, Influence du bord de la mer sur la structure des 
feuilles, Comptes rendus, tome 109, p. 204; Reclierches 
experim. sur les modific. des feuilles cliez les plantes rnari- 
times, Revue Generale de Bot., II., 1890, p. 55, etc. 
2 Scliimper (Die indo-malayiscke Strand flora, p. 19) and others 
have obtained similar results. 
