...This is apparently one of the most important protectivedevices to be found in Nature and the validity of it is nowgenerally conceded by naturalists... 
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」
...A careful review of these snakes is needed to verify the validity of the characters used to separate the subspecies and to determine areas of intergradation...
William E. Duellman 「Amphibians and Reptiles of the Rainforests of Southern El Peten, Guatemala」
...The taxonomic validity of Pseudoficimia pulcherrima remains doubtful,for only minor characters distinguish it from P...
William E. Duellman 「The Amphibians and Reptiles of Michoacán, México」
..." However, a check of old correspondence and accession records at the National Museum confirmed, beyond doubt, the validity of the locality data for these specimens...
John M. Legler 「A New Tortoise, Genus Gopherus, From North-central Mexico」
...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'」
...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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