...Unfortunately for scientists, however, these criteria of race are mostexasperatingly intermingled... 
W. E. Burghardt Du Bois 「The Conservation of Races」
... Up to this day, the criterion of certainty remains a mystery; this is owing to the multitude of criteria that have been successively proposed...
P. J. Proudhon 「What is Property?」
...Unfortunately, there are few criteria for determination of age incharadriiform birds...
Robert K Selander 「Vertebrates from the Barrier Island of Tamaulipas, México」
...From what has been said on the various characteristics ofthe different breeds of cattle, it must be evident, that no verydefinite criteria of excellence can be given for all good dairycows...
Richard L. Allen 「Domestic Animals」
...His criteria of a good South Down, are as follows:—"Thehead small and hornless; the face speckled or gray, and neithertoo long nor too short...
Richard L. Allen 「Domestic Animals」
...Here arecertain criteria for placing these insects before our minds in the orderthat nature has placed them...
Alpheus Spring Packard 「Our Common Insects」
...To conclude, it must be obvious, that permanent anatomical differencesare the only true criteria of distinctions of species...
George Vasey 「Delineations of the Ox Tribe」
...Tooth developmentand wear as criteria of age in white-tailed deer...
L. David Mech 「Ecological Studies of the Timber Wolf in Northeastern Minnesota」
...The application of the above criteria to specimens from Michoacán hasnot resulted in the recognition of two species...
William E. Duellman 「The Amphibians and Reptiles of Michoacán, México」
...If the characteristics usually employed in distinguishing and relatinggenera are ignored and other more subjective criteria areused, the relationships of Tantalophis still remain obscure...
William E. Duellman 「Systematic Status of the Colubrid Snake, Leptodeira discolor Gunther」
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