HOW MILK IS PRODUCED.
"Most persons think that giving down or holding up the milk by the cow is a voluntary act" (says John Burroughs, the well-known naturalist). In fact, they fancy that the udder is a vessel filled with milk, and that the cow releases or withholds it just as she chooses. But the udder is a manufactory; it is filled with blood, from which the milk is manufactured while you milk. This process is controlled by the cow's nervous system; when she is excited, or in any way disturbed, as by a stranger, or by taking away her calf, or by any other cause, the process is arrested, and the milk will not flow. The nervous energy goes elsewhere. The whole nervous energy process is as involuntary as is digestion in man, and is disturbed or arrested in about the same way.
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https://paperspast.natlib.govt.nz/newspapers/KCC19111209.2.18.2
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King Country Chronicle, Volume VI, Issue 421, 9 December 1911, Page 6
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144HOW MILK IS PRODUCED. King Country Chronicle, Volume VI, Issue 421, 9 December 1911, Page 6
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