...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」
...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」
...Waite has so generously admitted the validity ofmy answer to his criticism as regards meteors, I can do noless than admit that he scored one against me in his secondargument...
Various 「Astounding Stories, May, 1931」
...Hequestions the validity of his argument that bodies of greater size andbrightness should not serve the smaller, though not bright, and thatheaven should move, while the Earth remained at rest...
Thomas Orchard 「The Astronomy of Milton's 'Paradise Lost'」
...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」
...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」
...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」
...The nature and validity ofthe conclusions to be drawn can be best appreciated by a statement ofsome features of this tendency of the stars to crowd towards thegalactic circle...
Simon Newcomb 「Side-lights on Astronomy and Kindred Fields of Popular Science」
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