...The investigations madethus far for this causal factor have been fruitless...
U.S. Department of Agriculture 「Special Report on Diseases of Cattle」
...It is therefore impossible to offerstrict proof of the causal connection with the injection, and only oft-repeatedobservation could make this probable...
U.S. Department of Agriculture 「Special Report on Diseases of Cattle」
...So far the causal agent of thedisease has never been isolated, and inoculation experiments with the view ofartificially reproducing the disease have proved negative in every case...
U.S. Department of Agriculture 「Special Report on Diseases of Cattle」
...Theconnection between them is not external and superficial, butprofound, intrinsic, and causal...
Ernst Haeckel 「The Evolution of Man」
...This important causal nexus finds its simplestexpression in “the fundamental law of organic development,” thecontent and purport of which we have fully considered in the first chapter...
Ernst Haeckel 「The Evolution of Man」
...All that the opponents of freedom, as aclass, have ever claimed is the assertion of a causal connectionbetween the acts of the will and influences independent of the will...
Simon Newcomb 「Side-lights on Astronomy and Kindred Fields of Popular Science」
...That there is a causal connection no thoughtful person can doubt...
Garrett Serviss 「Curiosities of the Sky」
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