154 Halket .— The Effect of Salt on the Growth of Salicornia . 
when the plants remained alive and green when the salinity of water in soil 
rose at times to 17%, though they were not able to grow. 
4. The growth of Glyceria maritima is decreased with the increase of 
the salinity of the soil. 
After these experiments had been made, my attention was drawn to 
a paper by Mr. J. A. Terras, 1 in which he records the results he obtained 
with experimental cultures of certain salt marsh plants. He grew plants of 
Salicornia herb ace a, Suaeda maritima , Glaux maritima , Plantago maritima , 
and Spergularia media in sand in pots suspended in vessels containing 
nutritive solutions (Knop’s) made up with varying proportions of filtered and 
sterilized sea water. He continued his experiments for the much longer 
period of six months, from April to September. The general results 
recorded are similar to those given above. The effect of the salt varied 
with the different plants. Salicornia , Suaeda , and Glaux grew best when 
sodium chloride was present, while the greatest growth of Plantago and 
Spergularia took place in the absence of this salt. 
When the amount of growth in the varying concentrations of solution 
is compared, it is seen to be greatest in the case of Salicornia and Suaeda 
in those pots suspended in solutions containing 0.93 % of sodium chloride ; 
and the growth is found to decrease with increase in concentration of the 
solution. A difference is also seen on comparing the results of the higher 
percentages of salt, for plants of Salicornia herbacea and Suaeda maritima 
died in those pots in the liquid containing 3.2 % of sodium chloride, while in 
the experiments described above these plants were able to grow in much 
greater percentages of salt. 
1 Terras, J. A. : Notes on the Salinity of the Cell-sap of Halophytes with Relation to that of 
the Soil Solution in which they grow. Proc. Scot. Micro. Soc., vol. ix, nos. ii and iii. 
