Corylus, Pinus, Cycas, Canna, Allium, Asparagus, Phalaris, Zea, Avena,
Nephrodium, and Selaginella...10-66


CHAPTER II.

GENERAL CONSIDERATIONS ON THE MOVEMENTS AND GROWTH OF SEEDLING PLANTS.

Generality of the circumnutating movement--Radicles, their circumnutation
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 germination in Megarrhiza, etc.--Abortion of cotyledons-
-Circumnutation 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-
[page vi.]
gean hypocotyls--Circumnutation of hypocotyls and epicotyls when erect--
Circumnutation of cotyledons--Pulvini or joints of cotyledons, duration of
their activity, rudimentary in Oxalis corniculata, their development--
Sensitiveness of cotyledons to light and consequent disturbance of their
periodic movements--Sensitiveness of cotyledons to contact...Page 67-128


CHAPTER III.

SENSITIVENESS OF THE APEX OF THE RADICLE TO CONTACT AND TO OTHER IRRITANTS.

Manner in which radicles bend when they encounter an obstacle in the soil--
Vicia faba, tips of radicles highly sensitive to contact and other
irritants--Effects of too high a temperature--Power of discriminating