Images Dated 20th July 2008
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Featured 20 Jul 2008 Print
Diagram of beaks of Galapagos finches by Darwin
A classic illustration of evolutionary theory, made by Charles Darwin in his book "A Naturalist's Voyage", London 1889. The drawing shows the beaks of four species of finches found in the Galapagos Islands. Darwin drew the conclusion that they all probably came from a common ancestor, but had diversified and evolved to adapt to local food supplies on the different islands. In his own words, "Seeing this gradation and diversity of structure in one small, intimately related group of birds, one might really fancy that from an original paucity of birds in this archipelago, one species had been taken and modified for different ends."
© Dr Jeremy Burgess/Science Photo Library
Featured 20 Jul 2008 Print
Gas pillar in the Eagle nebula
Gas pillar in the Eagle nebula (M16), Hubble Space Telescope image. This is a 9.5-light-year-tall pillar of cold gas and dust silhouetted against a bright emission nebula. The dense pockets of dust and gas in this pillar may be in the process of condensing into stars. The upper part of the pillar is glowing as it is heated and compressed by radiation from hot young stars out of frame at upper left. The colours here come from ionised gases; the blue from oxygen and the orange from hydrogen. The Eagle nebula lies around 7000 light years from Earth in the constellation Serpens Cauda. This image was taken in November 2004 by the Advanced Camera for Surveys (ACS) on the HST
© Nasa/Esa/Stsci/Hubble Heritage Team/Science Photo Library
Featured 20 Jul 2008 Print
Galens spirit system
Galen's spirit system. Historical artwork of the internal organs depicting Galen's concepts of anatomy and spirit. Galen introduced the spirit system, consisting of natural spirit in the liver, vital spirit in the heart and animal spirit in the nervous system. Claudius Galen (129-199) was a physician who worked in ancient Rome. He began by studying the anatomy of dead gladiators, and later studied animals when human dissection was forbidden. He made many important discoveries about the movement of blood in the body, but mistakenly believed that the heart was a single, rather than a double, pump
© Sheila Terry/Science Photo Library
