of Terrestrial Algae. IT 
701 
Table IX. 
Recovery from plasmolysis , during prolonged exposure to the plasmolysing 
solution , <?;/ the part of various terrestrial forms. 
(In the case of each experiment the first line gives the original, the second the final condition.) 
Material. 
Expt. 
No. x 
Cells 
counted. 
Strength 
of sol. 
Strongly 
plasmolysed. pi 
Slightly 
asmolysed. 
Unaffected. 
Dead. 1 2 
Zygogonium 
IX, X 
1,987 
% 
5 
A 
69.9 
% 
12*2 
% 
17.9 
% 
2‘I ) 
>> 
99 
864 
5 
23.6 
39 - 6 
36.8 
2.4 1 
>> 
XVI 
1,226 
5 
71.8 
16-7 
1 1-5 
i 6-3 ) 
>> 
99 
756 
5 
2*8 
25.6 
71*6 
327 i 
9 9 
XX 
884 
6 (cold) 
55-3 
19.7 
25.0 
i 4 -i | 
99 
9 9 
887 
6 (cold) 
7-9 
33 *i 
59 -o 
i8*i ) 
11 
XX 
882 
6 (warm) 
45-6 
28-4 
26-0 
17-0 
99 
99 
759 
6 (warm) 
0*1 
12-0 
87.9 
2 5*5 1 
Hor mi ditun 
XI 
2,053 
5 
62*1 
33 *o 
4*9 
2-5; 
99 
9 9 
503 
5 
— 
86-3 
137 
4*2 i 
99 
XXVI 
1,503 
5 
56-0 
40’0 
4 -o 
9*9 ( 
9 * 
99 
524 
5 
— 
437 
5 6 '3 
147 s 
Frasiola 
XXVII 
1 >449 
20 
74 6 
11*0 
14-4 
i *3 } 
>> 
99 
455 
20 
— 
i -3 
987 
2*4 i 
Protonema 
XV 
1 > 2i 5 
5 
58-0 
27-9 
14-1 
- 1 
11 
406 
5 
22*2 
74’4 
3*4 
- s 
99 
XXIII 
887 
5 
53-7 
30-9 
i 5‘4 
- 1 
«>» 
>» 
618 
5 
25-1 
647 
10*2 
- i 
Pleitrococcus 
VII 
1,301 
25 
57 *i 
42-9 
- j 
u 
9 9 
632 
25 
32*1 
67-9 
— 1 
11 
XVII 
1,852 
25 
77*9 
22-1 
8-8 i 
99 
99 
1,028 
25 
777 
22*3 
8-o \ 
9 9 
XXVIII 
1,000 
20 
67-0 
33 *o 
25 H 
9 9 
99 
1,008 
20 
0.8 
99-2 
43 9 ) 
Cystococcus 
XXII 
818 
25 
87-2 
12*8 
- I 
99 
99 
613 
25 
8i-6 
18-4 
- 1 
Duralien of 
experiment 
[days). 
1 
5 
2 
2 
2 
4 
4 
6 
4 
3 
7 
8 
4 
The recovery in the filamentous forms is as a general rule very rapid. 
Thus, in Experiment XVI on Zygogonium the estimation of the original 
material (cf. Table IX) was made at 4.30 p.m. ; at 9.30 p.m. on the same 
day the figures obtained (866 cells counted) were: 19-2 per cent, strongly 
plasmolysed, 61 -6 per cent, slightly plasmolysed, and 19-2 per cent, unaffected. 
During the subsequent days (cf. Fig; 7) there was quite a gradual dimi¬ 
nution of the strongly plasmolysed cells, whilst the number of slightly 
plasmolysed ones remained practically constant till three days later, when 
a sudden rapid decrease was noted. Perfectly similat results were obtained 
in all the estimations of the filamentous algae, but in thfe case of the proto- 
nema the change is always more gradual and a relatively large number of 
the strongly plasmolysed cells fail to recover (cf. Table IX and F‘g- 7 )- 
1 In many cases a drought series and a recovery from plasmolysis estimation were carried out 
in the same experiment, the determination of the original material serving both as the starting-point 
of the drought estimations and as the first estimation of the material whose recovery from plasmolysis 
was to be studied. 
2 Cf. foot-note on p. 694. 
