SECONDARY EFFECTS OF FERTILIZATION. 



423 



integuments, in the carpels, and, finally, in the flowering axis which bears the wliole 

 of the structures concerned. These changes, which become manifest in the form of 

 growth, are executed on a definite plan in every plant, and depend on the peculiar 

 constitution of the protoplasm. The aim of these growth-changes is not difScult 

 to determine. The new organism which has arisen from fertilization must be 

 adequately provided for the future ; it is detached sooner or later from its parent- 



Fig. 31S.— Seeds witli winged and liairy appendages. 



1 Dehiscent fruit of Eriodendron; the seeds embedded in a hairy investment are visible between the valves. 2 Dehiscent fruit 

 of Gossypium herbaceum; the mass of seeds is contained in a hairy investment protruding from the valves. ^ .Seed of Aspen 

 (Poputus treimda) with silliy appendage. * The same seed stripped of its silk. 5 Winged seed of Lepigonnvi maiyinatwn. 

 6 Longitudinal section of tlie winged seed of Vochysia. 7 Winged seed of Cinchona, s Longitudinal section of this seed. 

 9 Winged seed of Cedreta Tovna. 10 Longitudinal section of same. *-3 magnified. (Partly after Baillon.) 



plant, and has to establish itself in a new place. The embryo requires special 

 equipment for its journey and for its start in life; it requires a means of dispei'sal 

 and protection against attacks from animals so long as it remains attached to the 

 parent-plant, it requires also protection against unfavourable climatic conditions. 

 These various equipments are provided by peculiar changes in the integument, 

 carpels, and receptacle, changes which are initiated at fertilization. 



