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Yawning is an involuntary action, associated with stretching the muscles. It is due to an effort of nature to correct over-venosity of the blood—that is, too much bJ.oo-sJ in the veins, resulting from fatigue.

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https://paperspast.natlib.govt.nz/newspapers/TS19310820.2.179

Bibliographic details

Star (Christchurch), Volume XLIV, Issue 197, 20 August 1931, Page 16

Word Count
34

Untitled Star (Christchurch), Volume XLIV, Issue 197, 20 August 1931, Page 16

Untitled Star (Christchurch), Volume XLIV, Issue 197, 20 August 1931, Page 16