Green himself was as severe a critic of the book as any one. Writing in 1877 to his future wife, he says, 'I see the indelible mark of the essayist, the "want of long breath", as the French say, the jerkiness, the slurring over of the uninteresting parts, above all, the want of grasp of the subject as a whole'. On the advice of some of his best friends, confirmed by his own judgement, in 1874 he gave up contributing to the Saturday Review, in order to free his style from the character imparted to it by writing detached weekly articles. The composing of these articles had been a pleasure; the writing of English history was to be his life-work, and no divided allegiance was conceivable to him. But we may indeed be thankful that he resisted the views of other friends who wished to drive him into copying German models. This class Green called 'Pragmatic Historians';[58] and, while acknowledging their solid contributions to history, he maintains his conviction that there is another method and another school worthy of imitation, and that he must 'hold to what he thinks true and work it out as he can'.

Green was a rapid reader and a rapid writer. In a letter to Freeman, written when he was wintering in Florence in 1872, he admits covering the period from the Peasant Revolt to the end of the New Learning (1381-1520) in ten days. But he was writing from notes which represented years of previous study. In another letter, written in 1876, he confesses a tendency to 'wild hitting', and perhaps he was too rapid at times in drawing his inferences. 'With me', he says, 'the impulse to try to connect things, to find the "why" of things, is irresistible; and even if I overdo my political guesses, you or some German will punch my head and put things rightly and intelligibly again.' It is this power of connecting events and explaining how one movement leads to another which makes the stimulating quality of Green's work; and to a nation like the English, too little apt to indulge in general ideas, this quality may be of more value than the German erudition which tends to overburden the intelligence with too great a load of 'facts'. And, after all the labours of Carlyle and Froude, of Stubbs and Freeman, and all the delving into records and chronicles, who shall say what are facts, and what is inference, legitimate or illegitimate, from them?

Whatever were the shortcomings of the book, which Green in his letters to Freeman called by the affectionate names of 'Shorts' and 'Little Book', it inaugurated a new method, and won a hearing among readers who had hitherto professed no taste for history; and, financially, it proved so far a success that Green was relieved from the necessity of continuing work that was uncongenial. He had already given up his parish in 1869. Ill-health and the advice of his doctor were the deciding factors; but there is no doubt that Green was also finding it difficult to subscribe to all the doctrines of the Church. He took up the same liberal comprehensive attitude to Church questions as he did to politics, and opposed any attempt to stifle honest inquiry or to punish honest doubt. He was much disturbed by some of the attempts made at this time by the more extreme parties in the Church to enforce uniformity. Also he felt that the Church was not exercising its proper influence on the nation, owing to the prejudice or apathy of the clergy in meeting the social movements of the day. If he had found more support, inside the diocese, for his social and educational work, the breach might have been healed, or at any rate postponed, in the hope of his health mending.

Relieved of parish work, he found plentiful occupation in revising his old books and in planning new; he showed wonderful zest for travelling abroad, and, by choosing carefully the places for his winter sojourn, he fought heroically to combat increasing ill-health and to achieve his literary ambitions. Thus it was that he made intimate acquaintance with San Remo, Mentone, and Capri; and one winter he went as far as Luxor in the hope that the Egyptian climate might help him; but in vain. Under the guidance of his friend Stopford Brooke he visited for shorter periods Venice, Florence, and other Italian towns. He was catholic in his sympathies but not over-conscientious in sight-seeing. When Brooke left him at Florence, Green was openly glad to relapse into vagrant pilgrimage, to put aside his guide-book and to omit the daily visit to the Uffizi Gallery. But, on the other hand, he reproached Freeman for confining his interests entirely to architecture and emperors while ignoring pictures and sculpture, mediaeval guilds, and the relics of old civic life. It was at Troyes that Bryce observed him 'darting hither and thither through the streets like a dog following a scent'—and to such purpose that after a few hours of research he could write a brilliant paper sketching the history of the town as illustrated in its monuments—but in Italy, as in France, he had a wonderful gift for discovering all that was most worth knowing about a town, which other men passed by and ignored.

Capri, which he first visited at Christmas 1872, was the most successful of his winter haunts. The climate, the beauty of the scenery, the simplicity of the life, all suited him admirably. On this occasion he stayed four months in the island, and he has sung its praises in one of the 'Stray Studies'. Within a small compass there is a wonderful variety of scene. Green delights in it all, 'in the boldly scarped cliffs, in the dense scrub of myrtle and arbutus, in the blue strips of sea that seem to have been cunningly let in among the rocks, in the olive yards creeping thriftily up the hill sides, in the remains of Roman sculptures and mosaics, in the homesteads of grey stone and low domes and Oriental roofs'. And he found it an ideal place for literary work, restful and remote, 'where one can live unscourged by Kingsley's "wind of God".' 'The island', he writes, 'is a paradise of silence for those to whom silence is a delight. One wanders about in the vineyards without a sound save the call of the vinedressers: one lies on the cliff and hears, a thousand feet below, the dreary wash of the sea. There is hardly the cry of a bird to break the spell; even the girls who meet one with a smile on the hillside smile quietly and gravely in the Southern fashion as they pass by.' No greater contrast could be found to the conditions under which he began his books; and it is not surprising that in this haven of peace, with no parish business to break in upon his study, he worked more rapidly and confidently—when his health allowed.

From such retreats he would return refreshed in body and mind to continue studying and writing in London and to sketch out new plans for the future. One that bore rich fruit was that of a series of Primers, dealing shortly with great subjects and commending them to the general reader by attractive literary style. They were produced by Macmillan, Green acting as editor; and notable volumes were contributed by Gladstone on Homer, by Creighton on Rome, and by Stopford Brooke on English Literature. Here, again, Green was a pioneer in a path where he has had many followers since; and he would have been the first to edit an English Historical Review if more support had been forthcoming from the public. But for financial reasons he was obliged to abandon the scheme, and it did not see the light of day till Creighton launched it in 1886.

In 1877 he married and found in his wife just the helper that he needed. She too had the historical imagination, the love of research, and the power of writing. Husband and wife produced in co-operation a small geography of the British Isles, well planned, clear, and pleasant to read. But, apart from this, she was content, during the too brief period of their married life, to subordinate her activities to helping her husband, and her aid was invaluable at the time when he was writing his later books. There is no doubt that his marriage prolonged his life. The care which his wife took of him, whether in their home in foggy London, or in primitive lodgings in beautiful Capri, helped him over his worst days; and the new value which he now set on life and its happiness gave him redoubled force of will. There were others who helped him in these days of perpetual struggle with ill-health. His doctors, Sir Andrew Clark and Sir Lauder Brunton, rendered him the devotion of personal friends. The historians gathered round him in Kensington Square, the home of his later years, and cheered him with good talk. Those who were lucky enough to be admitted might hear him at his best, discussing historical questions in a circle which included Sir Henry Maine and Bishop Stubbs, as well as Lecky, Freeman, and Bryce. He had many other interests. Such a man could not be indifferent to contemporary politics. His heroes—and he was an ardent worshipper of heroes—were Gladstone and Garibaldi, and, like many Liberals of the day, he was violent in his opposition to Beaconsfield's policy in Eastern Europe. Hatred of Napoleonic tyranny killed for a while his sympathy with France, and in 1870 he sympathized with the German cause—at least till the rape of the two provinces and the sorrows of disillusioned France revived his old feeling for the French nation. Over everything he felt keenly and expressed himself warmly. As Tennyson said to him at the close of a visit to Aldworth, 'You're a jolly, vivid man; you're as vivid as lightning'.

Particularly dear to him was the close sympathy of Stopford Brooke and that of Humphry Ward, to whose father he had been curate in 1860 and who had himself for years learnt to cherish the friendship of Green and to seek his counsel. Mrs. Ward has told us how she (then Miss Arnold) brought her earliest literary efforts to Green, how kindly was his encouragement but how formidable was the standard of excellence which he set up. She has also pictured for us 'the thin wasted form seated in the corner of the sofa... the eloquent lips... the life flashing from his eyes beneath the very shadow of death'. His latter years, lived perpetually under this grim shadow, were yet full of cheerfulness and of hope. However the body might fail, the active brain was planning and the high courage was bracing him to further effort. Between 1877 and 1880 he published in four volumes a History of the English People, which follows the same plan and covers much the same ground as the Short History. He was able to revise his views on points where recent study threw fresh light and to include subjects which had been crowded out for want of space. But the book failed to attract readers to the same extent as the Short History. The freshness and buoyancy of the earlier sketch could not be recaptured after so long an interval. In the last year of his life he began again on the early history of England, working at a pace which would have been astonishing even in a man of robust health, and he completed in the short period of eleven months the brilliant volume called The Making of England. He had thought out the subject during many a day and night of pain and had the plan clear in his head; but he was indefatigable in revising his work, and would make as many as eight or ten drafts of a chapter before it satisfied his judgement. His last autumn and winter were occupied with the succeeding volume, The Conquest of England, and he left it sufficiently complete for his wife to edit and publish a few months after his death.

The end came at Mentone early in 1883. Two years of life had been won, as his doctor said, by sheer force of will; but the frail body could no longer obey the soul, and nature could bear no more.