century, being republished multiple times. As early as 1830, astronomer John Herschel had already recognised the need for the genre of popular science. In a letter to philosopher William Whewell, he wrote that the general public needed "digests of what is actually known in each particular branch of science... to give a connected view of what has been done, and what remains to be accomplished." Indeed, as the British population became not just increasingly literate but also well-educated, there was growing demand for science titles. Mary Somerville became an early and highly successful science writer of the nineteenth century. Her On the Connexion of the Physical Sciences (1834), intended for the mass audience, sold quite well. Arguably one of the first books in the genre of popular science, it contained few diagrams and very little mathematics. It had ten editions and was translated to multiple languages. As its name suggests, it offered readers a broad overview of the physical sciences at a time when these studies were becoming increasingly distinct and specialised. It was the most popular science title from the publisher John Murray until Charles Darwin's On the Origin of Species (1859). Although Somerville's rendition of Pierre-Simon de Laplace's masterpiece Mécanique Céleste, The Mechanism of the Heavens (1831), was intended to inform the masses of the latest advances in Newtonian mechanics and gravitation, it was also used as a textbook for students at the University of Cambridge till the 1880s. The abolition of the newspaper stamp duty in 1855 and the advertising tax in 1858 paved the way for not only cheaper magazines but also those catering to a variety of interests. During the final three decades of the Victorian era, women's newspapers and magazines flourished and increasingly covered topics other than domestic issues, reflecting the trend among women at the time. The professional police force dedicated to not just the prevention but also the investigation of crime took shape during the mid-nineteenth century. This development inspired Charles Dickens to write the crime novel Bleak House (1852–3), creating the first fictional detective, Mr. Bucket, based on a real-life character by the name of Charles Field. But it was Arthur Conan Doyle's Sherlock Holmes who proved to be the most popular fictional detective of the Victorian age, and indeed, of all times. By the 1860s, there was strong demand for adventure, detective, sensational, and science-fiction novels. Indeed, the late nineteenth