...Many people in Kingston were accustomed to speculate in the purchase of those, who were left after the first day's sale... 
Thomas Clarkson 「The History of the Rise, Progress and Accomplishment of the」
...We had no time to exchange remarks with each other, or to speculate as to what was to be our fate...
W.H.G. Kingston 「The Two Supercargoes」
...Subsequently she was purchased and sold by different traders, who designed to speculate upon her as a "fancy article...
William Still 「The Underground Railroad」
...It is curious to speculate onthe habits of a creature in which the tail soobviously wagged the dog and whose articulationsall point to great freedom of movementup and down...
Frederic A. Lucas 「Animals of the Past」
...If we are to speculate on the mannerin which the Sorex vagrans rassenkreis originated we must inquireinto the nature and extent of these climatic changes...
James S. Findley 「Speciation of the Wandering Shrew」
...With regard, however, to that earlier period of over a thousand years ago, it is of little use to speculate...
Sidney L. Gulick 「Evolution Of The Japanese, Social And Psychic」
...It is rather unsafe to speculate upon what might take place in such an event...
Various 「The Brochure Series of Architectural Illustration, Vol. 1, No. 10, October 1895.」
... When we speculate upon the development of Chretien's moral ideas we are not on such sure ground...
Chretien DeTroyes 「Four Arthurian Romances」
...It is curious to speculate on what might have been thehistory of astronomy had Venus only been as large as Jupiter...
Robert Stawell Ball 「The Story of the Heavens」
...It is as reflection awakens that menare led to speculate upon the nature and origin of the moral feelings...
Dr. D.M. Brooks 「The Necessity of Atheism」
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