In summer 1858, at the height of this period of obscure tension, Dickinson began assembling her manuscript-books (or “fascicles”). She made clean copies of her poems on fine quality stationery and then sewed small bundles of these sheets together at the fold. Over the next seven years she created 40 such booklets and several unsewn sheaves, and altogether they contained about 800 poems. No doubt she intended to arrange her work in a convenient form, perhaps for her own use in sending poems to friends. Perhaps the assemblage was meant to remain private, like her earlier herbarium. Or perhaps, as implied in a poem of 1863, “This is my letter to the World,” she anticipated posthumous publication. Because she left no instructions regarding the disposition of her manuscript-books, her ultimate purpose in assembling them can only be conjectured.

Dickinson sent more poems to her sister-in-law, Susan Gilbert Dickinson, a cultivated reader, than to any other known correspondent. Repeatedly professing eternal allegiance, these poems often imply that there was a certain distance between the two—that the sister-in-law was felt to be haughty, remote, or even incomprehensible. Yet Susan admired the poetry’s wit and verve and offered the kind of personally attentive audience Dickinson craved. On one occasion, Susan’s dissatisfaction with a poem, “Safe in their Alabaster Chambers,” resulted in the drafting of alternative stanzas. Susan was an active hostess, and her home was the venue at which Dickinson met a few friends, most importantly Samuel Bowles, publisher and editor of the influential Springfield Republican. Gregarious, captivating, and unusually liberal on the question of women’s careers, Bowles had a high regard for Dickinson’s poems, publishing (without her consent) seven of them during her lifetime—more than appeared in any other outlet. From 1859 to 1862 she sent him some of her most intense and confidential communications, including the daring poem “Title divine – is mine,” whose speaker proclaims that she is now a “Wife,” but of a highly unconventional type.

Title divine – is mine!
The Wife – without the Sign!
Acute Degree – conferred on me –
Empress of Calvary!

In those years Dickinson experienced a painful and obscure personal crisis, partly of a romantic nature. The abject and pleading drafts of her second and third letters to the unidentified person she called “Master” are probably related to her many poems about a loved but distant person, usually male. There has been much speculation about the identity of this individual. One of the first candidates was George Henry Gould, a college classmate of her brother and the recipient in 1850 of a prose valentine from Dickinson. Some have contended that Master was a woman, possibly her friend Kate Scott Anthon or Susan Gilbert Dickinson. Richard Sewall’s 1974 biography makes the case for Samuel Bowles. All such claims have rested on a partial examination of surviving documents and collateral evidence. Since it is now believed that the earliest draft to Master predates her friendship with Bowles, he cannot have been the person. On balance, Charles Wadsworth and possibly Gould remain the most likely candidates. Whoever the person was, Master’s failure to return Dickinson’s affection—together with Susan’s absorption in her first childbirth and Bowles’s increasingly poor health—contributed to a piercing and ultimate sense of distress. In a letter, Dickinson described her lonely suffering as a “terror – since September – [that] I could tell to none.” Instead of succumbing to anguish, however, she came to view it as the sign of a special vocation, and it became the basis of an unprecedented creativity. A poem that seems to register this life-restoring act of resistance begins “The zeroes taught us phosphorus,” meaning that it is in absolute cold and nothingness that true brilliance originates.

Though Dickinson wrote little about the American Civil War, which was then raging, her awareness of its multiplied tragedies seems to have empowered her poetic drive. As she confided to her cousins in Boston, apropos of wartime bereavements, “Every day life feels mightier, and what we have the power to be, more stupendous.” In the hundreds of poems Dickinson composed during the war, a movement can be discerned from the expression of immediate pain or exultation to the celebration of achievement and self-command. Building on her earlier quest for human intimacy and obsession with heaven, she explored the tragic ironies of human desire, such as fulfillment denied, the frustrated search for the absolute within the mundane, and the terrors of internal dissolution. She also articulated a profound sense of female subjectivity, expressing what it means to be subordinate, secondary, or not in control. Yet as the war proceeded, she wrote with growing frequency about self-reliance, imperviousness, personal triumph, and hard-won liberty. The perfect transcendence she had formerly associated with heaven was now attached to a vision of supreme artistry.

In April 1862, about the time Wadsworth left the East Coast for a pastorate in San Francisco, Dickinson sought the critical advice of Thomas Wentworth Higginson, whose witty article of advice to writers, “A Letter to a Young Contributor,” had just appeared in The Atlantic Monthly. Higginson was known as a writer of delicate nature essays and a crusader for women’s rights. Enclosing four poems, Dickinson asked for his opinion of her verse—whether or not it was “alive.” The ensuing correspondence lasted for years, with the poet sending her “preceptor,” as she called him, many more samples of her work. In addition to seeking an informed critique from a professional but not unsympathetic man of letters, she was reaching out at a time of accentuated loneliness. “You were not aware that you saved my Life,” she confided years later.

Dickinson’s last trips from Amherst were in 1864 and 1865, when she shared her cousins Louisa and Frances Norcross’s boardinghouse in Cambridge and underwent a course of treatment with the leading Boston ophthalmologist. She described her symptoms as an aching in her eyes and a painful sensitivity to light. Of the two posthumous diagnoses, exotropia (a kind of strabismus, the inability of one eye to align with the other) and anterior uveitis (inflammation of the uvea, a part of the iris), the latter seems more likely. In 1869 Higginson invited the poet to Boston to attend a literary salon. The terms she used in declining his invitation—“I do not cross my Father’s ground to any House or town”—make clear her refusal by that time to leave home and also reveal her sense of paternal order. When Higginson visited her the next year, he recorded his vivid first impression of her “plain” features, “exquisitely” neat attire, “childlike” manner, and loquacious and exhausting brilliance. He was “glad not to live near her.”

In her last 15 years Dickinson averaged 35 poems a year and conducted her social life mainly through her chiselled and often sibylline written messages. Her father’s sudden death in 1874 caused a profound and persisting emotional upheaval yet eventually led to a greater openness, self-possession, and serenity. She repaired an 11-year breach with Bowles and made friends with Maria Whitney, a teacher of modern languages at Smith College, and Helen Hunt Jackson, poet and author of the novel Ramona (1884). Dickinson resumed contact with Wadsworth, and from about age 50 she conducted a passionate romance with Otis Phillips Lord, an elderly judge on the supreme court of Massachusetts. The letters she apparently sent Lord reveal her at her most playful, alternately teasing and confiding. In declining an erotic advance or his proposal of marriage, she asked, “Dont you know you are happiest while I withhold and not confer – dont you know that ‘No’ is the wildest word we consign to Language?”

After Dickinson’s aging mother was incapacitated by a stroke and a broken hip, caring for her at home made large demands on the poet’s time and patience. After her mother died in 1882, Dickinson summed up the relationship in a confidential letter to her Norcross cousins: “We were never intimate Mother and Children while she was our Mother – but…when she became our Child, the Affection came.” The deaths of Dickinson’s friends in her last years—Bowles in 1878, Wadsworth in 1882, Lord in 1884, and Jackson in 1885—left her feeling terminally alone. But the single most shattering death, occurring in 1883, was that of her eight-year-old nephew next door, the gifted and charming Gilbert Dickinson. Her health broken by this culminating tragedy, she ceased seeing almost everyone, apparently including her sister-in-law. The poet died in 1886, when she was 55 years old. The immediate cause of death was a stroke. The attending physician attributed this to Bright’s disease, but a modern posthumous diagnosis points to severe primary hypertension as the underlying condition.