...It is curious to observe how, in nature, organizations the most dissimilar are mutually dependent on each other for their perpetuation... 
David Livingstone 「Missionary Travels and Researches in South Africa」
..., perpetuation of the plant by hiding it from animals, with the view that ultimately its extensive appearance will sustain that race...
David Livingstone 「Missionary Travels and Researches in South Africa」
...What are theydoing at this moment? Voting supplies for Slavery—voting supplies forthe extension, the stability, the perpetuation of Slavery in this land...
Frederick Douglass 「Abolition Fanaticism in New York」
..." Poor, sorrowing, misguided woman! It was not for his country he died, but for the perpetuation of the cruel, the infamous system of human slavery...
Louis Hughes 「Thirty Years a Slave」
... TheSocialist demagogues know that as well as I, but they maintain themyth of the virtues of the majority, because their very scheme oflife means the perpetuation of power...
Emma Goldman 「Anarchism and Other Essays」
...The birds in captivity are not breeding, andso far as perpetuation by them is concerned, they are only oneremove from mounted museum specimens...
William T. Hornaday 「Our Vanishing Wild Life」
...The enormous losses that have been inflicted upon theworld through the perpetuation of follies with wild vertebrates andinsects would, if added together, be enough to purchase aprincipality...
William T. Hornaday 「Our Vanishing Wild Life」
...Hooper, now president of the American Bison Society, and an earnest promoter of the perpetuation of the bison...
William T. Hornaday 「Our Vanishing Wild Life」
...They are said also to be derived from terriers, and it seems tome that the perpetuation of malformation in several breeds will producethe turnspit...
R. Lee 「Anecdotes of the Habits and Instinct of Animals」
...He himself no longer needs to take thought either to preserve his life or to assure the perpetuation of his race...
Frédéric Houssay 「The Industries of Animals」
...Inthe habitual practice of such an ancient and traditional device, theIndians have lost all record of the real causes of the perpetuation ofthis requirement...
Victor Mindeleff and Cosmos Mindeleff 「A Study of Pueblo Architecture: Tusayan and Cibola」
...And the thought that such "beauty" has been of our own creation, orthat our own hands have assisted in its perpetuation, should certainlybe a deep "joy" of our life...
Lewis Falley Allen 「Rural Architecture」
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