...On one point only are they in harmony: namely, that the validity of the right of property depends upon the authenticity of its origin... 
P. J. Proudhon 「What is Property?」
...The whole subject of the validity of warning colorationhas recently been brought up for reconsideration by the illuminatinginvestigations of Mr...
Clarence M. Weed 「Butterflies Worth Knowing」
...There has, however, recently been a reactionamong naturalists in regard to the validity of many supposedexamples of warning coloration and the whole subjectis still open to careful investigation...
Clarence M. Weed 「Butterflies Worth Knowing」
...Handley (1966b:762) and Starrett and Casebeer(1968:12) expressed doubt as to the validity of the currently usedsubspecific names in this species...
J. Knox Jones 「Noteworthy Records of Bats From Nicaragua, with a Checklist of the Chiropteran Fauna of the Country」
...Sympatricoccurrence serves as an indicator of specific distinctness and is one ofthe more practical tests of species validity when cross-breedingexperiments are not possible...
John D. Lynch 「A Taxonomic Revision of the Leptodactylid Frog Genus Syrrhophus Cope」
...Because of these results, Williamsquestioned the validity of the assumption that P...
Charles L. Douglas 「Comparative Ecology of Pinyon Mice and Deer Mice in Mesa Verde National Park, Colorado」
...Okada (1934:17) questioned the validity of H...
Robert G Webb 「Some Reptiles and Amphibians from Korea」
...Even the validity of the genus is open to question;this problem is discussed at length in the section beyond entitled"Ptychohyla as a Natural Assemblage...
William E. Duellman 「A Review of the Middle American Tree Frogs of the Genus Ptychohyla」
...When one comes to French art it is stillmore difficult for us to realize that the ideas underlying itsexpression are ideas of import, validity, and attachment...
W. C. Brownell 「French Art」
...So long as the manner in which the planets came into beingcontinues an open question, conclusions about their timeof birth must remain of doubtful validity...
George C. Comstock 「A Text-Book of Astronomy」
...But in the proof of this greattheorem two influences were neglected, either of which isfatal to its validity...
George C. Comstock 「A Text-Book of Astronomy」
...He hadnot mentioned the affair of 1616 because he thought that order did notapply to this book in which he proved the lack of validity and ofconclusiveness of the Copernican arguments...
Dorothy Stimson 「The gradual acceptance of the Copernican theory of the universe」
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