X CONTENTS. 



Page 



The seed-lobe or cotyledon . . . .121 



Foundation of Jussieu's system . . ] 22 



The neck . . . . . . 123 



The gemlet or plumelet . . . ib. 



Arrangement of Seeds and Fruits . . .124 

 Labours of Gaertner, Richard, Mirbel, and Desvaux . 1 25 



Seeds, their varieties . . . ib. 

 Fruits, their varieties .... ib. 



GROWTH OF PLANTS 



Appropriate soil and situation . , 127 



DIFFUSION OF SEEDS .... ib. 



Number of seeds in poppy and in tobacco . .128 



Seeds diffused by animals . . . . ib. 



Spring mechanism of the seed organ . . ib. 



Details taken from the violet . . ib. 



Observations on heart's-ease . . .129 



Rose of Jericho . . . ib. 



Winged seeds of ash and sycamore . . .130 



Floating bulbs (if bulbs they are) of mosses . . ib. 



Mistake of Linnaeus . . . . ib. 



Discovery by J. Drummond . . ib. 



Green matter of Dr. Priestley . . . ib. 



GERMINATION . . . . ib. 



Indispensable for the seed to have been fecundated and 



ripened . . . . . .131 



Water indispensable . . . ib. 



Too much water injurious, and why . . . ib. 



Heat important, but too much of it injurious . . ib. 



Air necessary ..... 132 



Experiments of Homberg and Humboldt . . . ib. 



Light unfavourable to germination . . . ib. 



Remarks of Mirbel on light . . . ib. 



Time required for germination . . ib. 



Phenomena of Germination . . 133 



Enlargement and softening of the shell . . ib. 



Shell prevents the entrance of too much water . ; ib. 



Use of the seed-pulp .... ib. 



Experiments of Desfontaines and Vastel . ib. 



Upright Growth of Plants . . .134 



Experiments of Knight and Dutrochet . ib. 



Creeping stems . . . . ib. 



Weak stems . . . . ' . . ib. 



Twining stems . . . .135 



Germination of Plants with one Seed- Lobe . . . ib. 



Observations of Malpighi, Poiteau, and Yule . . ib. 



Daily history of a grain of wheat . ib. 



Cause of wheat being so prolific . . .136 



False alarm from a species of fly . . . . 137 



Young wheat eaten down with horses . . ib. 



Germination of the cabbage palm, from Von Martius . ib. 



Germination of Plants with two Seed-Lobes . 13Q 



More easily observed than the preceding . . ib. 



