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Physico-theology

Note h — BOOK I.

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In volucribus pulmones perforati aerem inspiratum in totam ventris cavitatem admittunt. Hujus ratio, ut propter corporis truncum Aere repletum & quasi extensum, ipsa magis volatilia evadant, faciliusque ab aere externo, proper intimi penum, sustententur. Equidem pisces, quò leviùs in aquis natent, in Abdomine vesicas Aere inflatas gestant: pariter & volucres, propter corporis truncum Aere impletum & quasi inflatum, nudo Aeri incumbentes, minus gravantur, proindeque levius & expeditiùs volant. Willis de Anim. Brut. p. 1. c. 3.

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