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This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. This work was reproduced from the original artifact, and remains as true to the original work as possible. Therefore, you will see the original copyright references, library stamps (as most of these works have been housed in our most important libraries around the world), and other notations in the work.This w...

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From Wilhelm Conrad Röntgen's search for new kinds of radiation resulted the discovery of the natural radioactivity of uranium by Antoine Henry Becquerel in 1896. This event opened a new era of science that can be considered as the beginning of nuclear sciences. The findings of Pierre and Marie Curie of radium and polonium as useful radiation source subsequently opened the way to the first applications of radiation in medicine. Over the decade...

Die befruchtende Wirkung der Lehre Darwins, die der ver­ gleichenden Anatomie und der Entwicklungsgeschichte ein so hat auch dem GebiB, einem ungeheures Arbeitsfeld eroffnete, Organsystem, das vorher wohl nur in der zoologischen Systematik, wenn auch hier in ausgiebigster Weise, Beachtung gefunden hatte, eine neue wichtige Rolle zugeteilt, nicht als ob seine Bedeutung fur dieselbe damit zu Ende ware: im Gegenteil! Sein hervorragen­ der Wert in...