CONTENTS. 



Intkodttction Pag.e 1-9 



CHAPTER I. 



The ClKOtTMNUTATING MOVEMENTS OF SbBDLING PLANTS. 



Brassica oleraoea, oiroumnutation of the radicle, of the arched hypo- 

 cotyl whilst still huried beneath the ground, whilst rising above 

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

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

 vations on various oi'gans in species of Githago, Gossypium, 

 Oxalis, Tropasolum, Citrus, ^soulus, of several Leguminous and 

 Cucurbitaceous genera, Opuntia, Helianthus, Primula, Cyclamen, 

 Stap^lia, Cerinthe, Nolana, Solanum, Beta, Ricinus, Quercus, 

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

 Avena, Nephrodium, and Selaginella 10-66' 



CHAPTEE 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 — Ciroum- 

 nutation of hypocotyls and epicotyls whilst still buried and 

 arched — ^Their power of rtmigbtening themselves— Bursting of 

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



