...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」
...It was useless to speculate upon chances...
Samuel White Baker 「In the Heart of Africa」
...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」
...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」
...He did not speculate concerning the origin of these injuries...
Henry S. Fitch 「Field Study of Kansas Ant-Eating Frog」
...Students of a great university had long since ceased to speculate aboutthe missing hand...
Various 「Astounding Stories of Super-Science July 1930」
...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」
...He then went on to speculate as to the cause of the planets' motion...
Oliver Lodge 「Pioneers of Science」
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