...To speculate was to wound himself in vain... 
Rafael Sabatini 「Captain Blood」
...It was useless to speculate upon chances...
Samuel White Baker 「In the Heart of Africa」
...Subsequently she was purchased and sold by different traders, who designed to speculate upon her as a "fancy article...
William Still 「The Underground Railroad」
...He tried to speculate on my Christian character...
Henry Bibb 「Narrative of the Life and Adventures of Henry Bibb, an American Slave, Written by Himself」
..." Itwere idle to speculate on the origin of the disease...
Dinks, Mayhew, and Hutchinson 「The Dog」
...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」
... Scholars have sought to fix the chronology of the poet's works, and have been tempted to speculate upon the evolution of his literary and moral ideas...
Chretien DeTroyes 「Four Arthurian Romances」
... When we speculate upon the development of Chretien's moral ideas we are not on such sure ground...
Chretien DeTroyes 「Four Arthurian Romances」
...But I tooklittle interest in the going; did not even bother to speculate as to thereason for his summons...
Various 「Astounding Stories of Super-Science July 1930」
...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 appears, therefore,useless to speculate on the probable actions of men in their nowterrestrial prison...
Cecil G. Dolmage 「Astronomy of To-day」
...He then went on to speculate as to the cause of the planets' motion...
Oliver Lodge 「Pioneers of Science」
...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」
...I speculate if I shall ever be one of those grotesque and melancholy beings, with bleared eyes and running noses, swollen bellies and shrunken legs! Ugh!—it is too likely...
Marcus Clarke 「For the Term of His Natural Life」
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