CONTENTS. 



INTRODUCTION Page 1-9 



CHAPTER I. 



THE ClRCUMNUTATING MOVEMENTS OF SEEDLING PLANTS. 



Brassica oleracea, circumnutation 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 Circumnu- 

 tation of the cotyledons Rate of movement Analogous obser- 

 vations on various organs in species of Githago, Gossypium, 

 Oxalis, Tropjeolum, Citrus, ^Esculus, of several Leguminous and 

 Cucurbitaceous genera, Opuntia, Helianthus, Primula, Cyclamen, 

 Stapelia, Cerinthe, Nolana, Solanum, Beta, Eicinus, Quercus, 

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

 Avena, Nephrodium, and Selaginella 10-66 



CHAPTER II. 



GENERAL CONSIDERATIONS ON THE MOVEMENTS AND GROWTH OF 

 SEEDLING PLANTS. 



Generality of the circumnutating movement Eadicles, their cir- 

 cumnutation of service Manner in which they penetrate the 

 ground Manner in which hypocotyls and other organs break 

 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 straightening themselves Bursting of 

 the seed-coats Inherited effect of the arching process in hypo- 



2033579 



