Glass milk bottle
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Glass milk bottles are glass bottles used for milk. They are reusable and returnable – used mainly for doorstep delivery of fresh milk by milkmen. Once customers have finished the milk, empty bottles are expected to be rinsed and left on the doorstep for collection, or rinsed bottles may be returned to a participating retail store. Bottle sizes vary depending on region, but common sizes include pint, quart or litre.
A modern British milk bottle owned by Dairy Crest
Examples of milk bottles from the late 19th century made by the Warren Glass Works Company
Five different Abbotts Dairies, Philadelphia, PA milk/cream bottles (c1920s–1960s)
A reusable half-pint glass milk bottle sealed with a disposable cardboard cap opened by pulling on a flap lifted up with a pointed opening tool
Milk
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Milk is a white liquid food produced by the mammary glands of mammals and the caecilian Siphonops annulatus. It is the primary source of nutrition for young mammals before they are able to digest solid food. Immune factors and immune-modulating components in milk contribute to milk immunity. Early-lactation milk, which is called colostrum, contains antibodies that strengthen the immune system and thus reduce the risk of many diseases. Milk contains many nutrients, including calcium and protein, but also lactose and saturated fat.
A glass of cow milk
Cows in a rotary milking parlor
Breastfeeding to provide a mother's milk
A goat kid feeding on its mother's milk