CONTENTS. 



IsTEODucTioN Page 1-9 



CHAPTER I. 



The Cikcumkutatixg Movements op Seedling Plants. 



Brassica oleracea, ciroumnutation of the radicle, of the arched hypo- 

 cotyl whilst still buried beneath the ground, whilst rising above 

 the ground and straightening itself, and when erect — Oircumnu- 

 tation of the cotyledons — Rate of movement — Analogous obser- 

 vations on various organs in species of Githago, Gossypium, 

 Oxalis, TropaeoUim, Citrus, iEsculus, of several Leguminous and 

 Cucurbitaceous genera, Opuntia, Helianthus, Primula, Cyclamen, 

 Stapelia, Cerinthe, Nolana, Solanum, Beta, Ricinus, Quercus, 

 Corylua, Pinus, Cycas, Canna, Allium, Asparagus, Phalaris, Zea, 

 Avena, Nephrodium, and Selaginella 10-66 



CHAPTEE 11. 



General Considerations on the Movements and Growth of 

 Seedling Plants. 



Generality of the circumnutating movement — Radicles, their cir- 

 cumnutation of service — Manner in which they penetrate the 

 ground — Manner in which hypocotyls and other organs hreik 



• through the ground by being arched — Singular manner of ger- 

 mination in Megarrhiza, &c. — Abortion of cotyledons^Ciroum- 

 nutiition of hypocotyls and epicotyls whilst still buried and 

 arched — ^Their power of rtiaighteDing themselves — Bursting of 

 the seed-ecats — ^Inherited effect of the arching process in hypo- 



