Vlll CONTENTS. 



Page 



Fertility of volcanic and basaltic soils , 91 



Digestion . , . . . .92 



Supposition of a sort of saliva . . il>. 



ORGANS OF CIRCULATION .... ib. 



The pith, popularly termed the heart . . . ib. 



No organ in plants like the animal heart . . . ib. 



Capillary attraction . . . .93 



Opinions of Grew, Malpighi, and Borelli . . . ib. 

 Opinions of Du Hamel, Saussure, Mirbel, aridT' A. Knight ib. 



Opinions of De La Hire, Perault, and De Candolle . ib. 



Dutrochet's celebrated experiments . 94 



Experiment by Hales . . . .95 



Experiment on the influence of heat . . . ib. 



Difference of the effect of day and night . 96 



Experiments and Researches on Circulation . ib. 

 Discovery by Corti ..... ib. 



Observations of Amici and Schultz . . . ib. . 



Experiments of Link . . . -97 



Experiments of Bischoff . . 98 



Preparation of the Pulp ., . .99 



How to obtain the water evaporated . . . ib. 



The usual proportion evaporated . * ib. 



Descent of the Pulp . . . ib. 



Experiments of Darwin, and T. A. Knight . .100 



Experiments of Du Hamel and De Sarrabat . . ib. 



Moving force not understood . . . ib. 



The Pulp Cells . . . . ib. 



Superfluous pulp stored up . . ib. 



Reservoir ceUs for this purpose . . ib. 



Descriptions by Malpighi and Dutrochet . . ib. 



Opinion of De Candolle . 101 



ORGANS OP AERATION .... ib. 



Plants destitute of lungs or gills . . ib. 

 Air indispensable to plants .... ib. 



Action of the animal lungs on air in the dark . . 102 



Action of plants on air in the light . . . ib. 



Oxygen and water given off . . ib. 

 Quantity of water exhaled .... ib. 



Light indispensable to aeration . . ib. 



Effects of shade on plants . . . .103 



Colour of leaves and flowers . . . ib. 



Opinions of Sennebier . . . ib. 



Autumnal changes of colour . . ib. 



Researches of Macaire . > . ib. 



Effects of smoke upon plants . 104 



Air purified by plants . . . ib. 



Deteriorated during the night . . . ib. 



Effects of azote on plants . . . ib. 



Evolution of heat in cuckoo-pint . * 105 



Odours of plants . . . . ib. 



