sentences:  Following his crisis of faith, and influenced in part by his friend Thomas Carlyle (whom he had first met in 1850), Ruskin shifted his emphasis in the late 1850s from art towards social issues.Nevertheless, he continued to lecture on and write about a wide range of subjects including art and, among many other matters, geology (in June 1863 he lectured on the Alps), art practice and judgement ("The Cestus of Aglaia"), botany and mythology ("Proserpina" and "The Queen of the Air").He continued to draw and paint in watercolours, and to travel extensively across Europe with servants and friends.