Agnes Marshall (left), from her cookbook, Mrs. A. B. Marshall's Larger Cookery Book of Extra Recipes. London: Marshall's School of Cookery, 1902. Courtesy of Hathi Trust. Marshall’s cookbooks featured recipes as well as advertisements for her “Patent Freezer” (right). From A.B. Marshall, The Book of Ices. London: Marshall's School of Cookery, [1885?]. Courtesy of University of Leeds Library via the Wellcome Collection