F. KiDD AND C. West 229 



The woik of Gressler(i7), Hackeubeig(]!J), Kiltz(23), and Gericke{i5) 

 throws perhaps the best liglit upon this question. These authors obtained 

 dry weight measurements from week to week. From the data so obtained 

 a complete analysis of the normal growth as compared with the growth 

 of plants from which various amounts of the initial food-reserves had 

 been removed, can be made. 



The following table and figures (Table V and Figs. 1-3) summarise 



some of the results obtained by Gericke (I.e.) with Helianthus anniius, 



var. Bismarchianiis. The results obtained with {a) normal plants, 



(6) plants from which one cotyledon and one foliage leaf were removed 



at a very early stage, and (c) plants from which both cotyledons were 



removed, are represented. 



Table V. 



Increase in dry iveight of A. normal plants of Helianthus annuus 



Bismarckianus ; B. plants froin which one cotyledon and one foliage 



leaf had been remolded; and C. plants from ivhicli both cotyledons had 



been removed. 



Drj' weight of five plants 



The arrow indicates the point at which flower-bud formation begins in the case of 

 normal plants. 



* These figures may be taken as values of the original amount of food-reserves. The 

 initial dry weight of the embryo, apart from the reserves, is negligible, and the seeds 

 are exalbuminous. The cotyledons and foliage leaves were removed from the experimental 

 plants during the first week of growth after the embryo had absorbed part of the food- 

 material stored in them. 



