I have elsewhere somewhat fancifully described the ruinous chapel and solitary grave-yard of Kirkmichael as lying on the sweep of a gentle declivity, within a few yards of a flat sea-beach, so little exposed to the winds, that it would seem as if "ocean muffled its waves in approaching this field of the dead." And so the two vegetations--that of the land and of the sea--undisturbed by the surf, which on opener coasts prevents the growth of either along the upper littoral line, where the waves beat heaviest, here meet and mingle, each encroaching for a little way on the province of the other. And at meal-times, and when returning homewards in the evening along the shore, it furnished me with amusement enough to mark the character of the several plants of both floras that thus meet and cross each other, and the appearances which they assume when inhabiting each the other's province. On the side of the land, beds of thrift, with its gay flowers the sea-pinks, occupied great prominent cushions, that stood up like little islets amid the flowing sea, and were covered over by salt water during stream-tides to the depth of from eighteen inches to two feet. With these there occasionally mingled spikes of the sea-lavender; and now and then, though more rarely, a _sea-aster_, that might be seen raising above the calm surface its composite flowers, with their bright yellow staminal pods, and their pale purple petals. Far beyond, however, even the cushions of thrift, I could trace the fleshy, jointed stems of the glass-wort, rising out of the mud, but becoming diminutive and branchless as I followed them downwards, till at depths where they must have been frequently swum over by the young coal-fish and the flounder, they appeared as mere fleshy spikes, scarce an inch in height, and then ceased. On the side of the sea it was the various fucoids that rose highest along the beach: the serrated focus barely met the salt-wort; but the bladder-bearing fucus (_fucus nodosus_) mingled its brown fronds not unfrequently with the crimson flowers of the thrift, and the vesicular fucus (_fucus vesiculosus_) rose higher still, to enter into strange companionship with the sea-side plantains and the common scurvy-grass. Green enteromorpha of two species--_E. compressa_ and _E. intestinalis_--I also found abundant along the edges of the thrift-beds; and it struck me as curious at the time, that while most of the land-plants which had thus descended beyond the sea-level were of the high dicotyledonous division, the sea-weeds with which they mingled their leaves and seed-vessels were low in their standing--fuci and enteromorpha--plants at least not higher than their kindred cryptogamia, the lichens and mosses of the land. Far beyond, in the outer reaches of the bay, where land-plants never approached, there were meadows of a submarine vegetation, of (for the sea) a comparatively high character. Their numerous plants (_zostera marina_) had true roots, and true leaves, and true flowers; and their spikes ripened amid the salt waters towards the close of autumn, round white seeds, that, like many of the seeds of the land, had their sugar and starch. But these plants kept far aloof, in their green depths, from their cogeners the monocotyledons of the terrestrial flora. It was merely the low _Fucaceæ_ and _Conferveæ_ of the sea that I found meeting and mixing with the descending dicotyledons of the land. I felt a good deal of interest in marking, about this time, how certain belts of marine vegetation occurred on a vast boulder situated in the neighbourhood of Cromarty, on the extreme line of the ebb of spring-tides. I detected the various species ranged in zones, just as on lofty hills the botanist finds his agricultural, moorland, and alpine zones rising in succession the one over the other. At the base of the huge mass, at a level to which the tide rarely falls, the characteristic vegetable is the rough-stemmed tangle--_Laminaria digitata_. In the zone immediately above the lowest, the prevailing vegetable is the smooth-stemmed tangle--_Laminaria saccharina_. Higher still there occurs a zone of the serrated fucus--_F. serratus_--blent with another familiar fucus--_F. nodosus_. Then comes a yet higher zone of _Fucus vesiculosus_; and higher still, a few scattered tufts of _Fucus canaliculatus_; and then, as on lofty mountains that rise above the line of perpetual snow, vegetation ceases, and the boulder presents a round bald head, that rises over the surface after the first few hours of ebb have passed.