Ann C. Halket. 
124 
immersed for a certain time in distilled water or in a 3% sodium 
chloride solution before they were weighed and dried. The 
percentages of water in the succulent parts of the plants were 
calculated from these weights. The percentage of water present 
in the succulent parts of those that had been immersed was greater 
than in those not immersed. This tends to show that water had 
been absorbed during immersion, especially as several plants were 
treated together to minimise the error introduced by the fact that 
plants from the same habitat do not necessarily contain the same 
percentage of water. The figures are given in Table I below:— 
TABLE I. 
Plant, Locality and Date. 
Condition of Plant. 
Weight in 
grammes 
of 
succulent 
part of 
plant. 
Dry 
weight in 
grammes 
of 
succulent 
part of 
plant. 
Percen¬ 
tage of 
water in 
succulent 
part of 
plant. 
Suceda maritima at Erquy, 
15/9/’09. 
Leaves, freshlygathered 
Leaves,after immersion 
of plant in distilled water 
1-2300 
1-2585 
0-1406 
0-1206 
88-6% 
90-4% 
Salicornia, from Erquy, 
27/9/m 
Plants fresh from the sod 
Plants after immersion 
in distilled water 
Plants after immersion 
in a 3% NaCl solution 
3-0210 
2-1770 
1-1745 
0-2950 
0-1750 
0-0990 
90- 2% 
92-0% 
91- 6% 
It will be seen from this table that plants that had been 
immersed contained, in their succulent parts, more than \% more 
water than those fresh from the soil. The time of immersion was 
longer in the case of leaves of Suceda and the increase in water- 
content was greater. Plants of Salicornia immersed in distilled 
water had a slightly higher water-content than those in the salt 
solution, though the time of immersion was the same. This 
indicates that water was absorbed more slowly from the salt 
solution. 
(ii.) By Estimating the Difference in the Concentration of a 
Solution of Sodium Chloride before and after the Immersion 
of Plants. 
A number of plants of Salicornia were immersed in a 3 % 
solution of sodium chloride. The plants were suspended in a well- 
corked flask containing the solution so that no evaproation should 
take place. They were left in the solution some time and then 
