Induced Variations in NaCl Content of Non- 263 
Halophytes. 
All the readings in Tables II—V were carried out simulta¬ 
neously at a temperature of about 12°C, with a variation of not 
more than 1*5 0 . 
The figures in the Tables lead to the following general 
conclusions :— 
1. Camellia japonica, Syringa vulgaris, Arum maculatum show 
at first a decrease in weight both in sea-water and in salt solution 
of approximately the same strength. 
2. After the first 3—6 hours this decrease is succeeded by a 
progressive increase in weight (except in the case of Arum) 
continuing to the end of the experiment. 
3. Ilex aquifolium, Cavendishia acuminata show a progressive 
increase in weight from the time of first immersion to the end of 
the experiment. 
4. All the leaves experimented with show an increase in 
sodium chloride content, in comparison with fresh leaves of the 
same plant. 
5. The greatest increase in sodium chloride content is found 
in those leaves that are most affected by spraying with sea-water 
in the experiments now being carried on. Thus in Syringa and 
and Arum —both strongly affected by slight spraying—the salt 
content increases from an average of about 1'0% to 4’5% and 8*1% 
respectively. In Ilex, Camellia and Cavendishia where no wilting 
occurs after spraying the leaf, the salt content rises from an average 
Q'5%, in the fresh leaf to about -9% in Ilex and Camellia, and to over 
2*0% in Cavendishia. 
6. The results showing the relative variation in weight and 
the increase of salt content are striking. In Camellia, Ilex, 
Cavendishia, the increase in weight must be due chiefly to the 
absorption of water, as the percentage increase in weight is greatly 
in excess of the percentage increase in salt content. In Syringa 
and Arum the percentage increase in salt content is sometimes 
greater than the percentage increase in weight. In Syringa in 
twelve hours the weight increased (average) 4’4%, whilst the salt- 
content increased (average) 3-6%. In A nun the weight decreased 
(average) 2 09%, whilst the salt content increased (average) 5-75%. 
7. After immersion in salt solutions for twelve or twenty- 
seven hours all the leaves experimented with shewed an increase 
in the osmotic pressure of the cell sap. Before immersion 
the leaf cells of all the plants were plasmolysed when placed in the 
sea-water or salt solutions of the strength used in the immersion 
