...Where there is an excess of air in thechest cavity, as in emphysema or in pneumothorax, the percussion sound becomesabnormally loud and clear... 
U.S. Department of Agriculture 「Special Report on Diseases of Cattle」
...The pulmonary emphysema which had caused this animal'sdeath was developed in the highest degree...
Honoré Bourguignon 「On the cattle plague: or, Contagious typhus in horned cattle. Its history, origin, description, and treatment」
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