Influence of Aeration of Nutrient Solution. [95 
Non-aerated. 
Plant 
Shoot 
Dry Weight in grams 
Root Whole Plant 
1 
- 1-363 
0.220 
1*583 
2 
1-444 
0-230 
1-674 
3 
1-092 
0105 
1-197 
4 
1-534 
0.190 
1 -724 
5 
1-935 
0276 
2-211 
6 
1-592 
0-178 
1-770 
7 
1-444 
0124 
1-568 
8 
1-350 
0191 
1-541 
9 
1-235 
0-178 
1-413 
10 
0-610 
0 081 
0-691 
Mean ... ... 1'537 + 0-084 
When the probable error is taken into consideration it must 
be concluded that there is no significant difference between the 
dry weight of the aerated and non-aerated cultures. But the 
experiment does not measure differences less than 10 per cent., 
as a recorded difference of this value has no real significance. 
This result agrees with that obtained by Free at Baltimore 
It does not however indicate that under all circumstances it would 
be impossible to obtain improved growth of buckwheat in water 
culture by aeraticyi. 
r 
Balsam. 
Series 5. 
The seed of Balsam used was “ Sutton’s Improved Rose- 
flowered,” and was kindly sent by Messrs. Sutton. The seeds 
varied considerably in size, and so they were graded before 
germination, those used having a weight between 0-01 and 0-02 gm. 
Owing to the small quantity of seed available only 10 cultures 
in all were grown, 5 aerated and 5 non-aerated. The dry weight was 
taken 50 days after sowing as before. The culture solution was 
the same as that used in Series 3. 
Seeds sown in Sphagnum, July 11. 
Seeds transferred to solutions, July 19. 
Solutions changed, July 28, August 14, 22. 
Cultures harvested, August 30. 
The dry weights were obtained as follows: 
Aerated. 
Non-aerated. 
Shoot 
1-9985 
1-309 
Root . 
0-5795 
0-452 
Whole Plant 
2-578 + 0-201 
1-762 + 0-178 
