136 LIVtNG PLANTS 



were obtained by the removal of the concur- 

 rent members. 



Seedlings of Zeamais, with the shoot emerg- 

 ing from the cotyledon, were placed entirely 

 inside of the apparatus, where they remained 

 for a period of eight to twelve days without 

 carbon dioxide. In such experiments the 

 plant evidentlj^ could carry on the extension 

 of the shoot only so long as food could be ob- 

 tained from the seed. To determine the ac- 

 tual constructive value of the stored food 

 in the seed, plants were allowed to remain in 

 the apparatus until the leaves exhibited indi- 

 Results cations of deterioration, which was eleven to 



with Zea fourteen days after the beginning of the exper- 



iment. The plants were more slender and the 

 leaves narrower than in control plants. A 

 small amount of starch was still to be ob- 

 served in the seeds, both in the plants grown 

 in the air free from carbon dioxide and in 

 normally grown plants of the same age. 



In darkness the stems are elongated and the 

 etiolated leaves are much narrower than in 

 normal plants. 



Specimens of Phoenix dactylifera were ob- 

 tained by the germination of the seeds of the 

 commercial date, a process requiring from 

 twenty to thirty days. The seed consists 

 largely of reserve cellulose, and according to 

 Haberlandt is sufficient to allow the forma- 



