CONTENTS. IX 



Page 



ORGANS OF S-ECRETION . . . . . 105 



Comparison with animal glands . . . ib. 



Poisons kill the individuals that secrete them . .106 



ORGANS OF SENSATION ... ib. 



Fancies of Darwin . . . ib. 



Sensitive plant . . . . ib. 



Experiments of Professor Burnet . . . 107 



Experiments of Dutrochet .... ib. 



Effects of poisons on plants . . ib. 



Experiments of Marcet, Macaire, Christison, and Turner ib. 



ORGANS OF REPRODUCTION . . . .108 



Discovery of the sexuality of plants . ib. 



Foundation of the Linnaean system . - ib. 



The Anthers and Pollen . . ' . ib. 



Structure of anthers . . . . ib. 



Singular anthers of laurel . . . . ib. 



Structure of pollen . . . . 1 09 



Description by Guillemin . . . ib. 



Researches of Adolphe Brongniart . . . ib. 



Observations of Amici . . . 110 



Pollen of the orchis . . . . ib. 



Observations of Needham and R. Brown . . . ib. 



Whether all things be alive .... ib. 



The Pistils and Seed- Organs . . ib. 



Action of the pollen on the pistil . . . ib. 



Experiments oil the hop by Lecoq . . . ib. 



Observations of Amici and R. Brown . .Ill 



According to Adolphe Brongniart . 112 



Experiments of Balliard .... ib. 



The situation of the seed-organ . . 113 



Its usual form . . . . .114 



Structure according to Gaertner and R. Brown . . ib. 



Misstatement of Linnaeus .... ib. 



Membranes of the seed-organ . . 115 



The outer membrane .... ib. 



The middle membrane . . . ib. 



The inner membrane . . . . . ib. 



Its chambers and partitions .... ib. 



The verge or placenta . . . . . 1 16 



The scar and seed-stalk . ib. 



Expansion of the seed-stalk . . . . ib. 



The pillar or column in the centre . . ib. 



The dehiscence of seed-organs . . . ib. 



The Seed 



The regions of a seed . . . 118 



Apertures of a scar . . . . ib. 



The shell or outer coat . . . . ib. 



Its uses . . . . . .119 



The kernel . . . . ib. 



Structure of the kernel . . . . ib. 



The outer and inner seed-pulp . . 120 



The embryo . . . . . ib. 



The radicle and its sheath . . . ib. 



