This letter from Leipzig, to Weber's publisher Leopold Voss in the same city, apologizes for the late delivery of two book manuscripts and expresses confidence that he and the publisher will have no difficulty in agreeing to a contract. The Weber brothers (Ernst, Wilhelm and Eduard) grew up in Wittenberg, where their father was a Professor of Dogmatics. They lived in the same house as Chladni, who stimulated in them a love of science. Each of them became distinguished scientists in their own right whose research advanced some of Chladni’s central themes and interests. Ernst Weber made significant contributions to the physiology of the senses and helped found the field of psychophysics. He was also Chladni’s first biographer. He made the first study of the perception of two close touches on various parts of the body (see E.H. Weber on the Tactile Senses (1996)). When Keats met Coleridge on Hampstead Heath in 1819, one of the topics of the older poet's monologue (along with nightingales, dreams, nightmares, the Kraken, mermaids, and ghost stories) was a theory about "single and double touch." In this Coleridge was surely echoing Weber's researches, perhaps relayed from Chladni through their joint acquaintance Lichtenberg at Göttingen. Wilhelm Weber was a physicist who derived a law of electric force and studied water and sound waves. The unit of magnetic flux (Wb) was named after him. Eduard was a physiologist at the University of Leipzig who studied human locomotion with his brother Wilhelm. He also collaborated with Ernst o the study of waves of sound, light, and liquid, after Chladni's work, resulting in the first account of hydrodynamics in the circulation of the blood. In 1825 the three brothers collaborated on a publication establishing the basic laws of hydrodynamics, which they dedicated to Chladni.