Scope and Contents Nine letters, November 1800, from Thomas Young to Dr W H Wollaston [William Hyde Wollaston, 1766-1828, chemist and physicist]. Addressed from 48 Welbeck Street to Cecil Street, Strand [London]. The letters concern their respective research and experiments on dispersion of crystalline and contain references to the work of Ramsden [Jesse Ramsden, 1735-1800, mathematician, optician, physicist and astronomical instrument maker] and to Newtonian theory of dispersion.The paper in which the...