464 



BROOKLYN BOTANIC GARDEN MEMOIRS 



Table 8 

 Showing Growth of Sunflower {Helianlhus annuus L.) in Contact with Wire Netting^ 



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^ 



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 



* 12 plants used in each experiment, {a) Plants in pairs; {b) in triplets. 

 " Plants in sixes. 



