. The effect of a strictly vegetable diet on the spontaneous activity, the rate of growth, and the longevity of the albino rat . Photographs of omnivorous male (left) and vegetarian male (right) at the age of i year 9 months 16 days.

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Photo credit: © The Bookworm Collection / Alamy / Afripics
License: Licensed
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Keywords: ., boo, bookcentury1900, bookdecade1910, booksubjectcbk, bookyear1912