By I. Müller (auth.), Prof. Dr. Peter Altmeyer, Dr. Klaus Hoffmann, Dr. Markus Stücker (eds.)

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The embrocations were composed of various plants and resins mixed with vegetable oil or animal, some of the perfumes and spices were rare and brought from afar'. Therefore the cultivation of perfume plants and the composition of cosmetics have always been an important manufacturing branch. Especially the cones on the head ("Salbkegel"), often depicted in wall paintings, were a fashionable kind to protect the skin. They were made of tallow impregnated with myrrh and acted like a pomade. When temperature rose the cones melted gradually into the hair and dripped down the face and body.

Hoffmann M. ) Skin Cancer and UV Radiation © Springer-Verlag Berlin Heidelberg '997 I. MOLLER 4 bathing, but also they warned of excessive sun exposure, because in view of the humoral pathology the continual insolation could provoke a blockade of the secretion by thickening of the fluids especially of the phlegma. 5 According the recommendations of Plinius (23-79) it could be helpful also to lay on the face the white of an egg. 6 In the same time the Greek physician Dioskurides (54-68 AC) published his comprehensive pharmacological manual, which included several compositions for treatment of the erythema and prevention from sunburning.

Only some years later the discovery of the oxygen (1772) by Carl Wilhelm Scheele (1742-1786) und Joseph Priestley (1733-1804) the Dutch physician and botanist Jan Ingenhousz (1730-1799) had furnished experimental proof of the dependance of carbon assimmilation on sunlight definitely. IS He could demonstrate the fact that plants are capable to build up organical substances by photosynthesis so that the essentiality of light for life was beyond doubt. The following experiments of the Swiss scholar and investigator of the physics of light Jean Senebier (1742-1809) who tried to find analogous processes in the animal organism failed, but investigating the influence of light on putrefaction of flesh he found out, that the process passed faster by darkness than by solar radiation.

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