The Microbiological Assay of ‘Vitamin B₁₂’ in the Milk of Different Animal Species

I. A table of the change of weight of various foods during domestic cooking is presented.Loss of weight varied between !3 and 37% for puff pastry, 7 and 33% for grilled fish and 13 and 39% for roast meats.Green leafy vegetables generally gained weight on boiling.2. A list of the wastage of fruits, vegetables and fish during preparation for the table is given and average values are compared with those in tables of food composition.Unavoidable waste is so great for many commodities that persons handling foods should avoid wastage due to careless preparation.