Bone Exposed to Acid and Twisted
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This figure shows a thigh bone that has been softened by exposing it to acid, then twisted in a knot to demonstrate it’s flexibility. Bones are composed of a “mineral” or hard substance and an “animal” or soft substance. The animal component can be removed by exposing the bone to extreme heat, causing the bone to become brittle and break easily. Similarly, the mineral component can be removed by exposing the bone to acid. Once the brittle mineral part is removed by the acid, the bone is soft and flexible.
Galleries
Human Skeletal SystemSource
Hooker, Worthington First Book in Physiology For the Use of Schools and Families (New York: Sheldon and Company, 1867) 15
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