She was a pioneer of expanding employment opportunities in administration and public service for educated middle-class women in the two decades before World War I. Hogarth had an important role in the production of the celebrated eleventh edition of The Encyclopædia Britannica.

Janet Courtney was a published author, including a biography of her late husband and a series of reminiscences detailing her academic and working life.

[3] Janet's father permitted her to go to Oxford University "because of the reassuring fact" that Elizabeth Wordsworth, the first principal of Lady Margaret Hall was "the daughter of one bishop and the sister of another".

[2] Hogarth later wrote that living at Lady Margaret Hall provided her with "the very first room I ever had to myself [which] made my first year at Oxford a joy, which only those who grow up in large families and cramped houses can possibly appreciate".

[4] Hogarth undertook the Literae Humaniores course, known as 'the greats', which consisted of Greek and Roman history, language studies and philosophy.

At that time the study of philosophy was exclusively a male preserve, so she needed special permission to attend some of the men's lecture courses.

[6] The Oxford Vice-Chancellor, Benjamin Jowett, agreed to allow Hogarth to join classes at Balliol College, where she attended lectures given by Richard Lewis Nettleship.

[7] After her final examinations in 1888 Hogarth graduated in philosophy, German and Greek, gaining a first-class pass in the Literae Humaniores course.

After consideration the bank directors chose two women clerks who had worked for the Royal Commission, Janet Hogarth and Miss Elsee (who had been educated at Girton College at the University of Cambridge and graduated with honours in the History Tripos).

During her time with the Bank of England, as she later wrote, she was "tempted... to throw prudence to the winds and adventure myself in the perilous paths of journalism", but was discouraged after making approaches to editors.

[18] The Book Club had been established in September 1905 in premises in Bond Street under the supervision of the advertising manager of The Times, Horace Everett Hooper.

He was replaced by Kennedy Jones who proceeded to instigate changes acceptable to the publishers (eventually leading to the winding up of the Book Club).

[22] In 1909 Hogarth shifted from the Book Club to the offices of The Encyclopædia Britannica in High Holborn in central London, where she was placed in charge of the female indexers for the eleventh edition.

[26] In December 1910 one of four dinners to celebrate the completion of the eleventh edition was held at the Savoy Hotel in honour of the women contributors to the encyclopædia.

[30] The Women's National Anti-Suffrage League (WNASL) was launched in July 1908 to counter a growing political acceptance of the inevitability of female enfranchisement.

[32] in 1933 she described the female vote as "a double-edged weapon of limited usefulness", involving women in "the strife" of political parties, "yet gave them only a very small percentage of representatives in Parliament".

[33] On 17 July 1911 Hogarth married William Leonard Courtney, editor of The Fortnightly Review and drama and literary critic of the The Daily Telegraph.

Courtney and her staff were assigned to produce a sample volume of articles from the encyclopedia proper, shortened and rewritten in plainer language and well illustrated with photographs and drawings.

Hooper proposed that a three-volume supplement to the eleventh edition be prepared, to include a history of the recent war, which was agreed to by the new owners.