Ce mémoire étudie les épitomés de la figure doppelganger en trois romans britanniques gothiques du XIXe siècle: Frankenstein de Mary Shelley, Strange Case of Dr. Jekyll and Mr. Hyde de Robert Louis Stevenson et Dracula de Bram Stoker. En utilisation avec les sources secondaires dont The Origin of Species et The Descent of Man de Charles Darwin, et The Uncanny de Sigmund Freud, je soutiens que le doppelganger symbolise les conventions sociales et les angoisses des hommes britanniques dans les années 1800. Grâce à un examen des représentations physiques et métaphoriques de la dualité et de la figure doppelganger dans la littérature primaire, je démontre que la duplicité était courante au XIXe siècle à Londres. En conclusion, les doppelgangers sont des manifestations physiques gothiques de terreur qui influencent les luttes avec bien séance, des répressions des désirs et des craintes de l'atavisme, de la descente et de l'inconnu dans le XIXe siècle. / This thesis investigates the representations of the doppelganger figure in three nineteenth-century British Gothic novels: Mary Shelley’s Frankenstein, Robert Louis Stevenson’s Strange Case of Dr. Jekyll and Mr. Hyde, and Bram Stoker’s Dracula. Using Charles Darwin’s The Origin of Species and The Descent of Man, and Sigmund Freud’s The Uncanny, I argue that the doppelganger symbolizes social conventions and anxieties of British men in the 1800s. By examining the physical and metaphorical representations of duality and the doppelganger figure in literature, I demonstrate that duplicity was commonplace in nineteenth-century London. I conclude that the doppelgangers are physical Gothic manifestations of terror that epitomize nineteenth-century struggles with propriety, repression of desires, and fears of atavism, descent, and the unknown.

From the first electric lights in London along Pall Mall, and in the Holborn Viaduct in 1878 to the nationalisation of National Grid in 1947, the narrative of the simple ascendency of a new technology over its outdated predecessor is essential to the way we have imagined electric light in London at the end of the nineteenth century. However, as this thesis will demonstrate, the interplay between gas and electric light - two co-existing and competing illuminary technologies - created a particular and peculiar landscape of light, a 'lightscape', setting London apart from its contemporaries throughout the late nineteenth and early twentieth centuries. Indeed, this narrative forms the basis of many assertions made in critical discussions of artificial illumination and technology in the late-twentieth century; however, this was not how electric light was understood at the time nor does it capture how electric light both captivated and eluded the imagination of contemporary Londoners. The influence of the electric light in the representations of London is certainly a literary question, as many of those writing during this period of electrification are particularly attentive to the city's rich and diverse lightscape. Though this has yet to be made explicit in existing scholarship, electric lights are the nexus of several important and ongoing discourses in the study of Victorian, Post-Victorian, Modernist, and twentieth-century literature. This thesis will address how the literary influence of the electric light and its relationship with its illuminary predecessors transcends the widespread electrification of London to engage with an imaginary London, providing not only a connection with our past experiences and conceptions of the city, modernity, and technology but also an understanding of what Frank Mort describes as the 'long cultural reach of the nineteenth century into the post-war period'.