[Frontispiece].—Desert types:
1, Rhipsalis pachyptera. 2, Haworthia Chalwinii. 3, Cereuscelsianus. 4, Cereus nigricans. 5, Aloe Davyana.6, Cotyledon undulata. 7, Haworthia tesselata.8, Crassula columnaris. 9, Mammillaria plumosa.10, M. obcordellum. 11, Mesembryanthemum Pearsoni.12, M. Lesliei. 2, 5, 6, 7, 8, 10, 11, 12, from SouthAfrica. 1, 3, 4, 9, from Central and South America.
FIG. PAGE
[1.][A Burrowing Lichen, Verrucaria calciseda][17]
[2.][The Glasswort, Salicornia europæa][18]
[3.][Mesembryanthemum Bolusii and M. Lesliei][21]
[5.][Inrolled Leaf of Crowberry, Empetrum nigrum][39]
[6.][Succession of Vegetation in Lakes: a, Marsh Zone.b, Reed Zone. c, Zone of Floating Vegetad, Zone of Submerged Vegetation (diagrammatic)][43]
[7.][Coral Root, Dentaria bulbifera][54]
[8.][Fruit of Giant Bell-flower, Campanula latifolia][56]
[9.][Fruit of Geranium][58]
[10.][Fruit of Viola][59]
[11.][Fruit of Erodium][60]
[12.][Diagram illustrating Fall of Seeds][64]
[13.][Wing-seeds and Plume-seeds][68]
[14.][Flower of Erodium][85]
[15.][Flower-head of Astrantia][86]
[16.][Dwarf Cornel, Cornus suecica][88]
[17.][Japanese Wineberry, Rubus phœnicolasius][90]
[18.][Flower and Fruit of Purple Toad-flax, Linaria purpurea][93]
[19.][Stem and Root Structure][112]
[20.][Genista sagittalis][118]
[21.][Leaf-mosaic in Azara microphylla][121]
[22.][Leaf of Weinmannia trichosperma][122]
[23.][Leaf-development of Arrow-head, Sagittaria sagittifolia][125]
[24.][Fruit of Coriaria japonica][128]
[25.][Wild Cabbage, Brassica oleracea][150]
[26.][A Myxomycete, Comatricha typhoides][158]
[27.][Leaf of Maidenhair-tree, Ginkgo biloba][163]
[28.][Great Butterwort, Pinguicula grandiflora ][To face 173]
[29.][Strawberry-tree (Arbutus Unedo) at Killarney ][To face 174]
[30.][Spiranthes Romanzoffiana ][To face 174]
[31.][Bird’s-nest Orchis, Neottia Nidus-avis][182]
[32.][Alpine Plant-boss ][To face 191]
[33.][Sedum primuloides][192]
[34.][New Zealand Veronicas][194]
[35.][Mountain Avens, Dryas octopetala][195]

P L A N T L I F E

CHAPTER I
ON FARLETON FELL

“I got up the mountain edge, and from the top saw the world stretcht out, cornlands and forest, the river winding among meadow-flats, and right off, like a hem of the sky, the moving sea.”—Maurice Hewlett: Pan and the Young Shepherd.

Travelling from Scotland by the London and North-Western Railway, as the train roars down the long incline which leads from Shap to the coastal plain of Lancashire, the eye catches, on the left-hand side, a strange grey hill of bare rock rising abruptly, the last outpost of the mountains. It is so different in appearance from the Westmorland fells which have just been traversed, that one looks at it with curiosity, and desires an opportunity of a nearer acquaintance. During the preceding half-hour we have been passing through country of the type that is familiar in the Lake District and in Wales—picturesque ridgy hills with rocky or grassy slopes, and fields and trees occupying the lower grounds. But over much of the surface of this grey hill there appear to be scarcely any plants. A dense scrub of Hazel and other small trees clings to its screes in patches, but the continuous mantle of vegetation is lacking.

The train speeds on through fertile ground with ripening crops and woods standing dense and green, and now on the right, where the low land merges with the sea, we view salt-marshes, which display yet another type of plant growth. Here trees and shrubs are absent, and the low-growing grey and green plants look fleshy and stunted.

In the last thirty miles, indeed, since the train left the summit of Shap, we have seen a number of very different types of vegetation, which appear associated with different types of landscape—the moory uplands, the naked limestone, the deep woods, the desolate salt-marsh. Let us in imagination climb the steep scarp of Farleton Fell, the grey hill of our opening sentence, and consider at leisure some aspects of this teeming plant world and its relations to the Earth on which it grows.

Clambering through a wilderness of stony screes we emerge at length on a bare grey tableland on which, in contrast to the rich country below, vegetation is strangely sparse, and bare rock is everywhere in evidence. If we let the eye sweep round the horizon, we note a similar contrast displayed on broader lines. On the one hand is the mountain-land, with its carpet of grass and heather extending to the very summits; on the other hand the broad expanses of bare sand and mud fringing Morecambe Bay, apparently devoid of any vegetation. And it occurs to us that, before we ponder over the variety and distribution of plant life on this world, we are faced at once with a more profound problem. On this breezy summit, with our minds expanded and stimulated by the sunlight and the breeze, and the broad and beautiful panorama spread around, we must for a moment try to take a wider outlook than

Him that vexed his brains, and theories built
Of gossamer upon the brittle winds,
Perplexed exceedingly why plants were found
Upon the mountain-tops, but wondering not
Why plants were found at all, more wondrous still!