...Enquiry into the Validity of the BritishClaim to a Right of Visitation and Search of American Vesselssuspected to be engaged in the African Slave-Trade... 
W. E. B. Du Bois 「The Suppression of the African Slave Trade to the United States of America」
...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」
...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」
...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」
...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」
...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」
...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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