their behavior, was more effective. English religious writer Hannah More (1745-1833) complained to her contemporary writer Horace Walpole, "In vain do we boast ... that philosophy had broken down all the strongholds of prejudice, ignorance, and superstition; and yet, at this very time ... Lavater's physiognomy books sell at fifteen guineas a set." Thomas Browne Lavater found confirmation of his ideas from the English physician-philosopher Sir Thomas Browne (1605–1682), and the Italian Giambattista Della Porta (1535–1615). Browne in his Religio Medici (1643) discusses the possibility of the discernment of inner qualities from the outer appearance of the face, and wrote: Browne reaffirmed his physiognomic beliefs in Christian Morals (circa 1675): Browne also introduced the word caricature into the English language, whence much of physiognomical belief attempted to entrench itself by illustrative means, in particular through visual political satire. Italian scholar Giambattista della Porta's works are well represented in the Library of Sir Thomas Browne including Of Celestial Physiognomy, in which della Porta argued that it was not the stars but a person's temperament that influences their facial appearance and character. In De humana physiognomia (1586), della Porta used woodcuts of animals to illustrate human characteristics. Both della Porta and Browne adhered to the 'doctrine of signatures'—that is, the belief that the physical structures of nature such as a plant's roots, stem, and flower, were indicative keys (or 'signatures') to their medicinal potentials. Period of popularity The popularity of physiognomy grew throughout the first quarter of the 18th century and into the 19th century. It was discussed seriously by academics, who believed in its potential. Use in fiction and art Many European novelists used physiognomy in the descriptions of their characters, notably Balzac, Chaucer and portrait artists, such as Joseph Ducreux. A host of 19th-century English authors were influenced by the idea, notably evident in the detailed physiognomic descriptions of characters in the novels of Charles Dickens, Thomas Hardy, and Charlotte Brontë. In addition to Thomas Browne, other literary authors associated with Norwich who made physiognomical observations in their writings include the romantic novelist Amelia Opie, and the travelogue author George Borrow. Physiognomy is a central, implicit assumption underlying the plot of Oscar Wilde's The Picture of Dorian Gray. In 19th-century American literature, physiognomy figures prominently in the short stories of Edgar Allan Poe. Phrenology Phrenology, a form of physiognomy, measures the bumps on the skull in order to determine mental