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"One of the simplest of the tissues in the body is called the <em>epithelium</em>, and its cells are called epithelial cells. It serves as a lining of various cavities, a covering for the surface of the body, and the essential part of various organs called glands." — Blaisedell, 1904

Cross-Section of the Epithelium

"One of the simplest of the tissues in the body is called the epithelium, and its cells are…

Two skullcaps used for defense of the head in the 16th century. The caps fit closely to the head. The cap on the left appears to be cloth lined with an iron frame. The cap on the right consists only of the iron frame. Both caps are from the 16th century.

Iron Skullcaps from the 16th Century

Two skullcaps used for defense of the head in the 16th century. The caps fit closely to the head. The…

"Until hard rock is reached the sides of the excavation are supported temporarily by a lining"&mdash;Finley, 1917

Shaft lining

"Until hard rock is reached the sides of the excavation are supported temporarily by a lining"—Finley,…

"Until hard rock is reached the sides of the excavation are supported temporarily by a lining"&mdash;Finley, 1917

Shaft lining

"Until hard rock is reached the sides of the excavation are supported temporarily by a lining"—Finley,…

A diagram showing the manufacture of a shoe.

Manufacture of a shoe

A diagram showing the manufacture of a shoe.