An essay on bread : wherein the bakers and millers are vindicated from the aspersions contained in two pamphlets : one intitled Poison detected : and the other, The nature of bread honestly and dishonestly made : proving the impossibility of mixing lime, chalk, whiting and burnt bones in bread, without immediate discovery : with plain and easy experiments to discover alum and other admixtures in bread, instantly : to which is added, an appendix, explaining the vile practices committed in adulterating wines, cider, porter, punch, vinegar, and pickles : with easy methods to detect such abuses /