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Johannes Müller in the 19th century - destiny of his life and work

Johannes Müller (1801-1858) was not only the leading German physiologist in the first half of the 19th century but the teacher of a whole generation of natural scientists including Hermann von Helmholtz, Ernst Brücke, Carl Ludwig, Emil Du Bois-Reymond, Rudolf Virchow and… Read More

Transformation forces of the air

a contribution to the chemistry main lesson of the 9th class of Waldorf schools

We present a guide for the chemistry main lesson of the 9th class of Waldorf schools, especially taking into account the characteristics of animal and human catabolism (linking up With the overview of plant anabnlism… Read More

The native species of the genus Hypericum compared

In Middle Europe the genus Hypericum is divided into six sections systemizing ten Hypericnm species according to morphological characteristics. In our proposed order, Hypericum perfomtum as a mesophil perennial plant is positioned between the related hygro- and xerophil species. Within… Read More

Wing pattern; ofbutterflies (Lepidoptem) as mirrors ofenvironmental colours and light

Research in the tropics of the southern continents as well as in the temperate regions during the last decades has reve.tled the intimate correlatiun of wing colourstion and Wing pattern in butterflies with the corresponding features of their… Read More