270 BOTANICAL GAZETTE [OCTOBER 
factors affecting growth remaining unchanged. Smaller weights also 
were used on the experimental plants, and the control plants were sup- 
ported by small weights, barely sufficient to counterbalance the weight 
of plant, attached as the larger weights were to the experimental plants, 
the cords running over pulleys. The experimental and control plants 
were now growing under exactly the same conditions, except that the 
former were subject to tension of 2008™ at the beginning, increased 
to 450°™ on March 19, and to 700o%™ on March 23, and finally to g50*™ 
on March 30. The experiment ended April 6. 
TABLE VIII.—Vicia Faba 
ne) = 
“il = 3 
BE6)¢ | 2 28 
E ye cas Height to 4th | Diam. just | Diam. just |22.E) : § 
grb ses ot re node in above rst below 4th ee se 2 E m 5 | 
Pp cm. leafin mm. | node in mm. | £ AS fxm] oe =a 
awo| a= So | &¢g 
Swell) as | °2 | &¢ 
7 e Sh v.a ot Es 
(a = A * 
| | 
Mar. | Apr. | Mar. | Apr. | Mar. | Apr. | Mar. | Apr. | Apr. | Apr Apr. | Apr 
Exp. 14 | 6 14 145°) 36 I 6 6 6 6 
1 Gare 21.3 69.8 ES 012023 5.0: 8 40! 4.82)-6:33 8.8 |24.91 1630.3/|22 75 
Control 
Av. :....|22.4 |66. |15.3 {18:0 | 6.01/ 8.40) 4.80 6.39 9-3 |20-59 141Q.4|2T.00 
Pe RE i | j | eens Se 
The results are given in table VIII. The breaking strength shows 
an increase of 4.35** or 21 per cent. for the experimental plants over 
the controls. The number of hard bast fibers, determined by method 
5, and the total xylem area by method 3, show an increase in the former 
of 14.8 per cent., and in the latter of 8.3 per cent. 
TAB LE IX.—Lupinus albus ees 
Height to Diam. oesitooe Ne: - Xylem 
No. of plant Height in cm. | cotviedons between gr area in 
| sagas and cotyledons pone 
| 
Pls Aeaii Meier SE | rae les | 
: | ' 
Mar, Mar. ! Mar. | Mar Mar. Mar. Mar. | Mar 
Exp. 2 Be 2 to) 2 30 3° a 
AV... Sarees 4-74 g.02 | 3.54 5.06 3.9% 2.91 839-4 | 9 
Control ; | 
7 | ‘ .800 
AV. cad ccd arent ie | 3-55} 3-97 | 3-70} 2-97 155 | 
ae 
Experiment 15. Lupinus albus, greenhouse culture.—This expe™ 
ment began March 2 and ended March 30, the experimental plants 
