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"A Cast of the External Auditory Canal. The auditory canal is a passage in the solid potion of the temporal bone. It is lined by skin on which there are fine hairs, and a set of glands secreting earwax, which serves to moisten the parts, catch particles fo dust, and keep away small insects." — Blaisedell, 1904

External auditory canal

"A Cast of the External Auditory Canal. The auditory canal is a passage in the solid potion of the temporal…

"Gastrula of a Chalk-sponge (Olynthus). A, external view." -Whitney, 1911

Chalk Sponge Gastrula

"Gastrula of a Chalk-sponge (Olynthus). A, external view." -Whitney, 1911

The external margin link border is found on the outside of a Greek kylix or wine-drinking cup. It is a scroll design of leaves connected like a chain.

External Margin Link Border

The external margin link border is found on the outside of a Greek kylix or wine-drinking cup. It is…

Illustration of a tangent line drawn from an external point to a parabola.

Tangent to a Parabola

Illustration of a tangent line drawn from an external point to a parabola.