The book is a speculative work on the existence and history of the lost continent of Lemuria, which Scott-Elliot suggests was a highly advanced civilization that existed in the Indian and Pacific Oceans.Scott-Elliot was a Theosophist, a member of a spiritual movement that emerged in the late 19th century, and his book reflects many of the Theosophical beliefs of the time. The book describes the supposed history and culture of Lemuria, including its technology, religion, and social structure.According to Scott-Elliot, Lemuria was a highly advanced civilization that existed on earth millions of years ago. He suggests that the Lemurians were a highly spiritual people who had developed advanced technology and had a deep understanding of the universe.The book also suggests that the Lemurians were responsible for the creation of other civilizations, including Atlantis and ancient Egypt, and that their influence can still be seen in various cultures and traditions around the world.While "The Lost Lemuria" is not widely read today, it remains an important work in the history of spiritualism and alternative theories of history. The book reflects the Theosophical movement's interest in ancient civilizations and spirituality, and its influence can be seen in other works of speculative fiction and alternative history.