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'This cat and Dutch guinea pig are very fond of playing hide and seek together.' From The Country-Side: A Wildlife Magazine, 19 January 1907.
'The cat and the guinea pig shown in the accompanying photograph belong to Miss Fyfield, of Thatcham, Berkshire, and are on excellent terms with one another. The guinea pig is of Dutch breed and is six years old, and he seems very fond of playing hide and seek with the cat in the garden. Thomas sometimes sleeps on the pig's hutch, and one night he fell in, but this did not worry him. He and his smaller companion simply rearranged themselves and curling up together, slept thus for the night.'
On the same page, 134, there is an advert for 'Daily Mail: The Naturalist's Daily Newspaper.' That's changed slightly.
A graph depicting ideal sexual communion (stimulation against time), from my well-thumbed copy of Theodoor Hendrik van de Velde's Ideal Marriage: Its Physiology and Technique (New York, 1930).