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abnormal butter acetic acid added adulterated albumen alcohol alkaline Allen ammonia amount apparatus arsenic baryta boiling bottle butter butter-fat c.c. of water carbazol carbonate casein cent cheese chemical chemists chloride colour combustion condensed milk containing cows cream density determinations diluted dissociation dissolved distillation dried drying error Estcourt estimation ether evaporated examined experiments extracted fatty acids filtered filtrate flask give grammes heat Hehner hydrochloric acid insoluble fatty iodine iodine absorption laboratory lactalbumen lard liquid matter method milk of sulphur mixed mixture nitrate nitric acid nitrogen paper pepper Pharmacopoeia piperidine piperine pipette potash potassium precipitate present Public Analysts pure reagent refractive index residue samples of butter saponification soap Society of Public soda-lime sodium soluble acids soluble fatty acids specific gravity starch substance sulphate sulphuric acid taken temperature titration tube Vieth volatile acids washed weight Westphal balance Wollny yeast