1911 Encyclopædia Britannica, Volume 24… (1911)
“ The result of this project was that Mrs Shelley wrote Frankenstein, Byron the beginning of a narrative about a vampyre, and Dr Polidori, Byron’s physician, a tale named The Vampyre, the authorship of which used frequently in past years to be attributed to Byron himself. Frankenstein, published in 1818, when Mrs Shelley was at the utmost twenty-one years old, is a very remarkable performance for so young and inexperienced a writer ”
