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Tropisms. 



Philosophy and terniinolog\ . 



Qeotropism. Statoliths. 



Thigmotropism. Tcndrils. Sensitivc plants. 



Hydrotropism. 



Osmotropism and clieniotropisin. 



Rheotropism. 



Thermotropisni. 



Heliotropism. 



Other tropisms. — Slcep nioveinents. 

 Turgor movements . 



Traps, trigger liairs, etc. 



Qyrations. 

 Cytoplasmic nioveinents. 



Streaming. 



Rotation. 

 Movement of plastids. 



Locomotion. - Amoeboid movements, By cilia, Flagella. 



Other means of locomotion. 



Locomotion in particular groups, e. g. Diatoms. 

 Taxies. 

 Général. — Geotaxy. — Thigmotax\ . — Osmotaxy and chemotaxy. Rhcotaw 



— Thermotaxy. — Phototaxy. — Oalvanotaxv. Other taxies. 



Movements in particular species or groups. 

 Irritability. 



Guttation. 



Glandular action. — Nectar. 

 Pigmentation. — Anthocvanotin. 

 Products. 

 Variation and heredity. 

 General on variation. 



Philosophy and classification of subject. 

 Text-books and popular présentations. 

 Methods of investigating variation. 

 Biométrie methods. 

 Aids to biometry and statistical méthode. 



Physiological, embryological and cytological aspects. 

 The production of variations. 

 Variation and de\elopment. 



Variation at particular developmental stages. 



Variation and recapitulation. 

 Correlated variation. 



Immédiate corrélation. 



