Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
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Explains Crooke, "Pure-thin and cleere ayre" will "sooner receive the sound" than "Ayre which is contained in a concavous or hollow place." (31) Bacon goes on to write that although thin air accepts the sound well, being "better pierced," "Thinner or Drier Aire, carrieth not the Sound so well, as more Dense." (32) The time of day or year matter because these variables determine the heaviness and moisture of the medium.
Female tentorium dorsal part shape: absent (0), concavous (2), strait or flat (3).