36 
Part I (Bot. Not. 1917. H. 6). Among types of 
shore vegetation the vegetation of rocky shores is 
especially well represented. Analysis made with the 
aid of Rannkiaers statistic method are given from 
different localities, for example from a flat, gently slo¬ 
ping shore north of Torekov (p. 267), from the north 
point of the island (p. 271), and from the rocky islet 
Oreskär (p. 274). The frequency is calculated in per 
cent. Other lists of plants from other localities, especi¬ 
ally from the surrounding islets are also published. 
Their vegetation is however less typical on account 
of the fact that seeds from the inland are disseminated 
by sea birds. Analyses are also published from the 
meadow vegetation near the shore and from the alder 
swamps (pp. 280—285). 
As regards the sandy shore analysis are made 
from Sandhamn (p. 276). Tests from the soil have 
shown, that in the case of sandy and of flat, rocky 
shores the percentage of salt in the soil rapidly de¬ 
creases when one moves from the sea. The percentage 
of water in the upper layer of the soil is, on the other 
hand, .comparatively high. 
On exposed places the zones are spread over a 
great surface, in calm bays they lie closer. The com¬ 
position of the litoral zone depends to a large extent 
upon the mecanical effect of the water. Spergularia 
salina , Glyceria maritima (and Aster tripolium) appear on 
both rocky and sandy shores, but only on the latter 
do they go down to the litoral zone ( Spergularia goes far 
beyond this zone). 
The physical character of the soil determines to a 
large extent the composition of the halophytes of the litoral 
zone. The flat, with narrow cracks intersected shore at 
Ödegården (in the zone, characterized by the lichens 
Placodinm and Xanthoria ; p. 268) only four species 
occur, while on the rocky shore at St. Tånge (p. 271) there 
