in a very unsystematic fashion to substances of diverse kinds which have only certain surface-qualities in common" (Burton 1906). Soft-paste porcelain Swan tureen , 1752-6, Chelsea . Flower centrepiece, 18th century, Spain. Contents 1 Scope 2 Materials 2.1 Methods 2.1.1 Forming 2.1.2 Glazing 2.1.3 Decoration 2.1.4 Firing 3 History 3.1 Chinese