1. See Lawrence Branyan, Neal French, and John Sandon, Worcester Blue and White Porcelain, 1751–1790: An Illustrated Encyclopaedia of the Patterns (London: Barrie and Jenkins, 1981). Butterflies and moths can be distinguished in several ways, although the insect illustrated in this pattern bears characteristics of both. Like a butterfly, it has knobs on the end of its antennae; like a moth, it hovers while sipping the nectar (butterflies hold their wings together above the back while sipping, requiring the support of a leaf or flower).
2. See Donald C. Peirce, English Ceramics: The Frances and Emory Cocke Collection (Atlanta, Ga.: High Museum of Art, 1988), pp. 209, 210.
3. Graham Hood, Bonnin and Morris of Philadelphia: The First American Porcelain Factory, 1770–1772 (Chapel Hill: University of North Carolina Press, 1972), p. 33.
4. Willett Whitehead joined his cousin, carver and gilder Marinus Willett Pike (1783–1837), who had apprenticed under the great Samuel Salter. Pike had been sent from New York in 1801, at the age of eighteen, for the apprenticeship. See Apprentice Agreement of Marinus Willett Pike to Samuel Salter, Philadelphia City Archives.