...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」
...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」
...Students of a great university had long since ceased to speculate aboutthe missing hand...
Various 「Astounding Stories of Super-Science July 1930」
...He then went on to speculate as to the cause of the planets' motion...
Oliver Lodge 「Pioneers of Science」
...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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