...In walking it progresses slowly, arching its back and doubling itsfore-feet so as to put the upper surface to the ground and not thepalm... 
Robert A. Sterndale 「Natural History of the Mammalia of India and Ceylon」
...This doubling of the single median foot of the bivalve may be anartistic necessity for the sake of balance, or perhaps represents bothfoot and siphon at the same end...
Alfred M. Tozzer and Glover M. Allen 「Animal Figures in the Maya Codices」
...In thisway Plato demonstrated the doubling by means of lines, as the figureappended at the bottom of the page will show...
Vitruvius 「Ten Books on Architecture」
..., to the 4, always doubling the last numbers...
George Forbes 「History of Astronomy」
...Thus, form a doubling series like this,1½, 3, 6, 12, 24, &c...
Oliver Lodge 「Pioneers of Science」
...Follow a curveof fifteen stars, doubling back to a quadrangle from five to threedegrees on a side, and thirty-five degrees from the pole, for hishead...
Henry Warren 「Recreations in Astronomy」
...Wesaw of these Birds in our Passage to the Northward, after doubling CapeHorn...
James Cook 「Captain Cook's Journal During the First Voyage Round the World」
...It was remarked by Laplace that this invention was themeans of doubling the life of an astronomer, besides enabling him toavoid errors and the tediousness associated with long and abstrusecalculations...
Thomas Orchard 「The Astronomy of Milton's 'Paradise Lost'」
...But, strangely enough, Professor Lowell does not so far attemptto fit in the doubling with his body of theory...
Cecil G. Dolmage 「Astronomy of To-day」
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