paper ... ...analysis, carefully recording the names and addresses of the vendors and the dates of purchase. He then did a detailed analysis of each sample and published the results in The Lancet as reports of the Analytical Sanitary Commission. Hassall analyzed the samples first with a microscope, and then with chemical tests as necessary. Before Hassall's time the microscope had been ignored as an analytical tool, but it proved invaluable for identifying foreign vegetable matter, living or dead