...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」
...At the end of a half hour of waiting I began to speculate...
Various 「Ainslee's, Vol. 15, No. 5, June 1905」
...Not being able to do more than speculate on the intellectual andnervous capacity of animals, we are apt to assign to them some measureof human powers of thought and feeling...
Alfred E. Pease 「The Badger」
...'Well, then, will you speculate on him yourself for the buss-masters?'asked Mr...
R. S. Surtees 「Mr. Sponge's Sporting Tour」
... 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」
...What use now to speculate on what he might havedone...
Charles Willard Diffin 「Brood of the Dark Moon」
...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」
...He then went on to speculate as to the cause of the planets' motion...
Oliver Lodge 「Pioneers of Science」
...Every work on astronomy tells in a general way of thebelts of Jupiter, and many speculate upon their causes...
Simon Newcomb 「Side-lights on Astronomy and Kindred Fields of Popular 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」
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