Intestines a Fine Engraving of the Gut and Associated Vessels

Close-up of X-Ray Photograph of Skull

Close-up of X-Ray Photograph of Fingers

Close-up of X-Ray Photograph of Skull

Close-up of X-Ray Photograph of Skull

Human Skeleton Compared with That of a Gorilla

Dinosaurs of the Jurassic Period: a Stegosaurus with a Compsognathus in the Background

X-Ray Photograph of Skull

Close-up of X-Ray Photograph of Ribcage

Anatomy of the Eyes

X-Ray Photograph of Person's Hand

Close-up of X-Ray Photograph of Hand

View of the Muscles in the Human Body

Tyrannosaurus

Allosaurus and Camptosaurus, Museum

View of the Muscles in the Human Body

Skeleton and a Skull and Crossbones

World's Largest Tyrannosaurus Rx, Drumheller, Alberta, Canada

Skeleton of an Adult Patient Afflicted with Rickets

Royal Tyrrell Museum of Palaeontology, Drumheller, Alberta, Canada

Royal Tyrrell Museum of Palaeontology, Drumheller, Alberta, Canada

What the Brain Does

This Painting Shows the Growth Cycle of Tiny Plants and Animals in Arctic Waters

This Drawing Shows How a Jumping Spider Uses Its Four Pairs of Eyes to Sense Food, a Mate, or Prey

The Arteries of the Human Body

Diagram of the Effects of Oil and Oil Spills on Wildlife

Diagram Showing How Pancreatic Cells Can be Transplanted from Donor to Recipient

Side View of the Brain

Illustration of the Skull of a Bushman of the Hottentot Tribe Africa

The Five Senses Sight Hearing Smell Taste Touch