In search of coolness, I think usually of green; of, say, Lawrence Durrell and Panos heading for Klepini to gather cyclamens. ‘Though it was only a few hundred feet up we had moved into different air. The faint luminous tremble of damp had gone from the sky, and the sea which rolled below us among the silver-fretted screen of olives was green now, green as a Homeric adjective.’ Or W. H. Hudson’s ‘green refreshing nooks’. Or Andrew Marvell’s doubled greenness, ‘green thought in a green shade’.
But is blue, in some of its variations, even cooler?
In one of his essays, Geoffrey Grigson wrote of the spring gentian, ‘which properly is an alpine; and which I first saw like the flash of a sapphire ring lost in the grass as a car took me quickly along the sea road from Ballyvaughan around Black Head. Its colour is deep and clear enough for one to be able to pick it out in that way, pick out a mere single flower in the grass as one goes by at forty miles an hour. The spring gentian is one of several flowers, most of them blues, whose colour seems to have depth, like the colour coming from a jewel stone.’
‘Most of them blues’: yes, depth and richness. The title of Penelope Fitzgerald’s last published novel, The Blue Flower, drawing on the brief life of Friederich von Hardenberg, who used the pseudonym of ‘Novalis’ and died at the age of twenty-eight, already seems to carry the kind of resonance that greater specificity will not further enrich.
Ella Maillart inventively extends the context of the flower Grigson terms ‘properly an alpine’, writing that, ‘The higher you climb on mountains, the deeper is the cobalt of the gentian, the green of the turf, the scarlet of the alpine rose. The same seems to apply to Asian mosaics the further one climbs back in time. Then at a certain altitude, ice and rock prevail, all vegetation having disappeared. So, before the twelfth century, as far as I know, there is no coloured enamel: ascetic plain brick reigns supreme beside the snow of stucco-work.’
Famously, D. H. Lawrence writes of Bavarian gentians, native to the European Alps:
Not every man has gentians in his house
in soft September, at slow, sad Michaelmas.
Bavarian gentians, big and dark, only dark
darkening the day-time torch-like with the smoking blueness of Pluto’s
ribbed and torch-like, with their blaze of darkness spread blue
down flattening into points, flattened under the sweep of white day
torch-flower of the blue-smoking darkness, Pluto’s dark-blue daze,
black lamps from the halls of Dis, burning dark blue,
giving off darkness, blue darkness, as Demeter’s pale lamps give off
lead me then, lead the way.
Reach me a gentian, give me a torch!
let me guide myself with the blue, forked torch of this flower
down the darker and darker stairs, where blue is darkened on blueness.
even where Persephone goes, just now, from the frosted September
to the sightless realm where darkness was awake upon the dark
and Persephone herself is but a voice
or a darkness invisible enfolded in the deeper dark
of the arms Plutonic, and pierced with the passion of dense gloom,
among the splendour of torches of darkness, shedding darkness on the
lost bride and her groom.
In her introduction to Lawrence’s 1920 novel The Lost Girl, Carol Siegel remarks that ‘The most important referent for Alvina’s experience is the myth of Persephone.’ She points to this 1928 poem and comments that, ‘Many of Lawrence’s other writings refer to the myth less directly.’ Well yes, just a few. She mentions his Twilight in Italy and cites Virginia Hyde’s essay, ‘”Lost” Girls’ as providing ‘a full discussion of the recurrence of references to the Persephone myth in Lawrence’s work’.
Cool enough in the underworld, surely, all that damp earth – though conditions vary dramatically. In Dante’s Hell, the third circle offers perpetual icy rain and the ninth an icy lake, though with a bit of infernal flaming in between.
Lawrence’s Lydia, originally Polish, feels a rather different chill after her husband’s death in The Rainbow: ‘She was like one walking in the Underworld, where the shades throng intelligibly but have no connection with one. She felt the English people as a potent, cold, slightly hostile host amongst whom she walked.’
Yes, that would cool the blood, for sure.
And in the end there is always cool blues—or cool jazz—as reported by Lew Archer when he visits The Listening Ear, which is ‘full of dark blue light and pale blue music. A combo made up of piano, bass fiddle, trumpet, and drums was playing something advanced. I didn’t have my slide rule with me, but the four musicians seemed to understand each other. From time to time they smiled and nodded like space jockeys passing in the night.’
 Lawrence Durrell, Bitter Lemons (London: Faber and Faber, 1959), 221.
 W. H. Hudson, Afoot in England (1909; London: Dent, 1924), 32. The phrase ‘green nook’ recurs in the work of his friend Ford Madox Ford: Letters of Ford Madox Ford, edited by Richard M. Ludwig (Princeton: Princeton University Press, 1965), 105; The Cinque Ports (Edinburgh and London: William Blackwood and Sons, 1900), 360; No Enemy (1929; edited by Paul Skinner Manchester: Carcanet Press, 2002), 112.
 Andrew Marvell, ‘The Garden’, in The Complete Poems, edited by Elizabeth Story Donno (Harmondsworth: Penguin Books, 1985), 101.
 Geoffrey Grigson, ‘The Melancholia of Burren’, in Country Writings (London: Century Publishing, 1984), 156.
 Ella K. Maillart, The Cruel Way: Switzerland to Afghanistan in a Ford, 1939 (1947; Chicago: Chicago University Press, 2013, with a new foreword by Jessa Crispin), 123-124.
 D. H. Lawrence, ‘Bavarian Gentians’, The Complete Poems, edited by Vivian de Sola Pinto and F. Warren Roberts (Harmondsworth: Penguin Books, 1977), 697; for a variant version, see 960.
 D. H. Lawrence, The Lost Girl, edited by John Worthen, with an introduction and notes by Carol Siegel (Cambridge edition, 1981; London: Penguin, 1995), xxiii, xxiv, xxix; Virginia Hyde, ‘“Lost” Girls: D. H. Lawrence’s Versions of Persephone’, in Elizabeth T. Hayes, editor, Images of Persephone: Feminist Readings in Western Literature (Gaines: University Press of Florida, 1994). Andrew Radford has since published The Lost Girls: Demeter-Persephone and the Literary Imagination, 1850-1930 (Amsterdam: Rodopi, 2007): Chapter 6 is ‘Lawrence’s Underworld’.
 D. H. Lawrence, The Rainbow, edited Mark Kinkead-Weekes, introduction and notes Anne Fernihough (Cambridge, 1989; Penguin edition with new editorial matter, 1995), 50.
 Ross Macdonald, The Galton Case (1959), in Four Novels of the 1950s, edited by Tom Nolan (New York: Library of America, 2015), 700.