464 BROOKLYN BOTANIC GARDEN MEMOIRS 
TABLE 8 
Showing Growth of Sunflower (Helianthus annuus L.) in Contact with Wire Netting® 
| ; : 3 : : 
Average Dimensions and Weight in Centimeters and Grams 
Experiment ae Internodes | Pp Gai 
Height! oe ay a eat Wekee in Hagen 
| Number Length by Contact 
(a) Normal....... 108.80 1.35 TAc2e. Nip MOLOws Ne Aes | 
Contact wire..| 138.91 | 1.33 14,8. | 10:4) |p 267-9 27% 
(b) Normal......., 81.5 | 0.80 17 Ala, O06 
__Contact wire. .| 109.2 | o:84 ||) 242504) 4:5 cpl O256 33% 
TABLE 9 
Showing Growth of Sunflower (Helianthus annuus L.) Surrounded by Wire and Twine. 
60 Plants Used in Each Test. Experiment Made in Greenhouse in Benches® 
| Average Dimension and Weight in Centimeters and Grams 
| | ri Percent Gain in 
Height | Diameter | Internode | Weight | Moisture Height by 
Length Percent Gontace 
Normal 5 oes | 132.5 1.59 8:02) 22133 87.6 
Contact wire......| 151.0 1.46 9.01 | 216.0 89.6 15% 
Contact twine=....- 155.0 1.43 | 871 || 210.0) 7) 90:4 16% 
Contact fish net...) 159.0 1.40 | 10.50 l“x60!0" =z9r'8=| 20% 
The average diameter of the stems of the normal was 1.2 cm. and 
for those in contact 1.24 cm. The average number of internodes 
for the normal was 13 and for the contact plants 13.6; while the 
average length of internodes for the normal was 6.8 cm. and that for 
the contact plants 8.9 cm. or a gain of 30 percent. The average 
weight for the normal plants was 243 grams and for the contact 216 
grams. The diameter, number and length of internodes was slightly 
greater in the contact than in the normal. The average weight was 
12 percent greater in the normal than in the contact plants. The 
moisture contents of the plants were greater in the contact plants 
than in the normal ones. The most important difference between 
the normal and contact plants is in the length of internodes. 
RESPONSE OF PLANTS TO CONTACT WITH EXCELSIOR 
All of the experiments with excelsior were made with seedlings and 
were carried on in darkness. These were made in large flower pots 
containing either soil or sawdust. The excelsior was packed loosely 
over the, soil or sawdust as the case might be at the time the seeds 
8 12 plants used in each experiment. (qa) Plants in pairs; (0) in triplets. 
9 Plants in sixes. 
