38 
Markable result was found, that the permeability in these 
plants was very slight or not even measurable (time of 
experiment average 6 hours). The slight permeability 
for sodium chloride may be interpreted as a high tide 
adjustment, preventing the plants from taking up too 
much salt. That, notwithstanding, some salt is taken 
up by these plants is shown by salt analysis. Honcke- 
nya for instance has an unmeasurable permeability, 
but contains l,i6^ salt on its natural locality. 
The power of keeping down the accumulation of 
salt may determine how far a plant is able to go down 
towards the sea. An internal concentration equal with 
the concentration of the medium may be considered 
as the minimum of salt accumulation. In the litoral 
zone Aster is holding 2,3s a litoral form of Atriplex 
only 1 ,90 % . In Honclenya, on the conti ary, the sab 
accumulation is considerable higher (Tab. Ill p. 9 
which perhaps explains the fact, that this plant is not 
able to enter the litoral zone. 
* r 
These plants, however, are able to endure for a 
shorter time (1 à 2 weeks) considerable amounts of 
salt in their tissues without dying. Atriplex , growing in 
the lower supralitoral zone, was found to contain more 
than 4 per cent salt, and Hondcenya accumulated even 
6,83 % salt when grown in a 4 per cent solution. 
As seen from the experiments the maritime phanero¬ 
gams are the much more sensible to the poisonous die- 
\ 
mical-physical effect of the salt. Armeria ceased to 
grow already in 0,6 % NaCl. Also the halophytes show 
specific, different hardiness towards NaCl. 
The osmotic pressure is regulated in connection 
with the salt accumulation; a part of the osmotic sub¬ 
stances produced in the cells will be eliminated ( Atriplex 
latifolium , Tab. I Y and follow.). The pressure rises 
therefore always slower than the salt accumulation. 
c. The amount of transpiration was determined in a 
< 
