Eugene Halton has claimed that Stuart-Glennie’s most significant idea was his theory, first published in 1873, of what he termed "the moral revolution", delineating deep changes across different civilizations in the period 2,500 years ago, roughly centered around 600-500 BCE. It formed the second stage of his three stage "Ultimate Law of History." This historical shift around roughly 600 BCE in a variety of civilizations, most notably ancient China, India, Judaism, and Greece, was termed the
Axial Age ("die Achsenzeit") by
Karl Jaspers in 1949. In his last publication on the moral revolution, published in 1906 in
Sociological Papers, Stuart-Glennie reiterated his thesis: “…one great epoch can be signalised—that which I was, I believe, the first, thirty-two years ago ([
In the Morningland:] “New Philosophy of History,” 1873), to point out as having occurred in the sixth (or fifth-sixth) century B.C. in all the countries of civilisation from the Hoangho to the Tiber. There arose then, as revolts against the old religions of outward observance or custom, new religions of inward purification or conscience—in China, Confucianism; in India, Buddhism; in Persia, Zoroastrianism; in Syria, Yahvehism (as a religion of the people rather than merely of the prophets), and changes of a similar character in the religions also of Egypt, of Greece, and of Italy.” Stuart-Glennie's theory of the moral revolution was part of a broader three phase critical philosophy of history, which included gradations unexplored by Jaspers, such as a view of prehistory as “panzoonist” in outlook, a worldview of revering “all life” as a religious basis for conceiving nature. Stuart-Glennie proposed
panzooinism in 1873 as an alternative to E. B. Tylor’s theory of animism, which appeared in 1871. Whereas Tylor’s idea of animism held that spirit inhabits things from without, Stuart-Glennie’s panzooinism allowed that inherent powers of nature are worthy of attention and devotion. Stuart-Glennie's model of religion and history thus originates out of perceptive relations to habitat, that is, as motivated by the belief in the livingness of things as providing clues for human living. As he put it in 1876, "the Civilisations prior to the Sixth Century B.C. were chiefly determined by the Powers and Aspects of Nature, and those posterior thereto by the Activities and Myths of Mind." By contrast, Jaspers denied major significance to religions prior to the Axial Age. Stuart-Glennie’s theory of the moral revolution is set in the context of a comparative theory of history that gave great attention to material conditions, as well as to pre-Axial folk cultures and civilizations, both of which Jaspers undervalued or ignored. Where Jaspers’ theory of the Axial Age was arguably flawed by ethnocentrism, Stuart-Glennie’s philosophy of history was unfortunately flawed by his acceptance of the “scientific” racism of the times, illustrated in his claim that civilization began in the “Conflict of Higher and Lower Races.” As a young man of twenty-one Stuart-Glennie had met and traveled with the well-known philosopher John Stuart-Mill, whose middle name was given to him by his father, philosopher James Mill, to honor Stuart-Glennie's grandfather, Sir John Stuart. Mill approved of Stuart-Glennie's interests in positive science and history, and also influenced his conception of humanitarianism, which became a key element of Stuart-Glennie’s third phase of history. Mill said of Stuart-Glennie that he was, "a young man of, I think, considerable promise, who occupies himself very earnestly with the higher philosophical problems on the basis of positive science." Stuart-Glennie met and became a friend of Irish playwright, critic, and political activist George Bernard Shaw in 1885. Both shared an interest in socialism. In his preface to his play,
Major Barbara, Shaw compared Stuart-Glennie favorably to Friedrich Nietzsche. Shaw described Stuart-Glennie’s writing on how religious legitimation could be used for social dominance, instilling fear and subordination in the underclass, and false hope in a just afterlife: the rise of what Stuart-Glennie called the “Hell religions.” Stuart-Glennie was also seen, by Shaw, as a successor to
Henry Buckle, with a theory of origins of civilization and religious transformations going back some eight thousand years, and based on racial foundations. In his 1956 book,
The Transformations of Man,
Lewis Mumford credited him with anticipating Jaspers'
Axial Age concept. Mumford became aware of Stuart-Glennie’s work around 1920, while editing
The Sociological Review in London, through Stuart-Glennie’s friend and Mumford’s mentor sociologist Patrick Geddes. As a disciple of Buckle, with whom he travelled, Stuart-Glennie was heavily criticised by
John Mackinnon Robertson in
Buckle and His Critics; Robertson took up challenges to his account of Buckle in
Pilgrim Travels, made in the biography by
Alfred Huth, was dismissive as callow of the theories about the era of 600 BC, and discounted
John Fiske as a supporter of Stuart-Glennie. Robertson’s dismissal of Stuart-Glennie’s original thesis concerning the era of the moral revolution demonstrate how the times were not ready for an idea that only became widely known after Jaspers’ book in the mid twentieth century. In 1885 Stuart-Glennie met and befriended
George Bernard Shaw in London at the house of
Jane Wilde, known as "Speranza". He took part in a socialist demonstration in
Trafalgar Square, in 1887. He clashed with
Annie Besant in wanting to include family matters in the charter of the
Social Democratic Federation during the 1880s; and was later a
Fabian for a time, before coming up against the same issue of women's rights as foundational. Stuart-Glennie was also a founding contributor to the emergence of sociology, as Eugene Halton has shown. He was an active participant in the fledgling Sociological Society of London in the first decade of the twentieth century, and a friend of early sociologist and fellow Scotsman Patrick Geddes and also Victor Branford. Geddes published an obituary for Stuart-Glennie in the new sociological journal,
The Sociological Review, in 1910. Geddes’ review begins: "Of the many historical, sociological, and philosophical writings of the late Mr. J. S. Stuart-Glennie three characteristic examples are to be found in
Sociological Papers, Vol. II." In one of his papers delivered to the society, published in 1906, he predicted a Russian revolution and transformation of Europe by the year 2000, a "United States of Europe." Stuart-Glennie was involved in the attempt to set up a Celtic League in 1886, and in Scottish activism of the 1890s.
Patrick Geddes was influenced by his pan-Celticism. ==Folklore==