...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」
...The fundamental description of variation inbreeding schedules must itself be detailed in several ways and beyondthis there are causal factors needing examination...
Richard F. Johnston 「The Breeding Birds of Kansas」
...Theconnection between them is not external and superficial, butprofound, intrinsic, and causal...
Ernst Haeckel 「The Evolution of Man」
...The causal character of the relation which connects embryologywith stem-history is due to the action of heredity and adaptation...
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」
...That there is a causal connection no thoughtful person can doubt...
Garrett Serviss 「Curiosities of the Sky」
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