...There was no improvement, but rather a deterioration from the days of Pliny... 
Richard F. Burton 「Two Trips to Gorilla Land and the Cataracts of the Congo Volume 2」
...If the present conditions in the Wyomingelk herds continue to prevail for several generations, as sure astime goes on we shall see a marked deterioration in the size andantlers of the elk...
William T. Hornaday 「Our Vanishing Wild Life」
...In the twin certainties of over-population, and deterioration fromexcessive killing of the good sires, we have to face two newproblems of very decided importance...
William T. Hornaday 「Our Vanishing Wild Life」
...According to theexperience of the world in the breeding of domestic cattle (nothorses), we should expect physical deterioration, thedevelopment of diseases, and disaster...
William T. Hornaday 「Our Vanishing Wild Life」
...The deterioration through disease, especiallytuberculosis, that always is dreaded and often observed in closelyin-bred domestic cattle, has been totally absent...
William T. Hornaday 「Our Vanishing Wild Life」
...In these examples the deterioration of the milk in casein on the lessnutritious winter feeding is very marked, although the relative quantity ofbutter remains almost unchanged...
U.S. Department of Agriculture 「Special Report on Diseases of Cattle」
...The inertia is complete; nevertheless their appearance remains excellent, without a trace of the brownish tinge, the sign of deterioration...
J. Henri Fabre 「More Hunting Wasps」
...The house had then alreadyundergone much deterioration...
Henry S. Fitch 「Ecological Observations on the Woodrat, Neotoma floridana」
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