CONTENTS. 



IntrodtjCtiox .. Pao-e 1-i) 



CHAPTER I. 



The Ciecttmnutating Movements of Seedling Plants. 



Brassica oleracea, cireumnntation of the radicle, of the arolied hj'po- 

 cotyl whilst still buried beiieath the ground, whilst rising above 

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

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

 vations on various organs in species of.Githago, Gossypiuin, 

 Oxalis, Tropseolum, Citrus, jEscuIus, of several Leguminous and 

 Cucurbitaceous genera, Opuntia, Helianthus, Primula, Cyclamen, 

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

 Corylus, Pinus, Cycas, Canna, Allium, Asparagus, Phalaiis, Zea, 

 Avena, Nephrodium, and Selaginella 10-66 



CHAPTER II. 



Genekal Considerations on the Movements and Growth of 

 Seedling Plants. 



Generality of the circumnutating movement — Eadicles, their cir- 

 eumnntation of service — Manner in which they penetrate the 

 ground — Manner in which hypocotyls and other organs bied.k 

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

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

 nutation of hypocotyls and epicotyls whilst still buried and 

 arched — Their power of ptruighteDing themselves— Bursting of 

 the seed-ccats — Inherited elTect of the arching process in hypo- 



