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Development of morphological and physiological mosaics in the Loranthaceae and Viscaceae families

The histories of development of N nytsia flor'ibunda and Viscum album are compared. Both plant species show»morphological«penetrations called mosaics.

N uytsia floribzmda develops a morphological mosaic by penetration of root and… Read More

The egg shell structures of reptiles as a picture of the animal's constitution

The articles on bird egg shells in the Tycho de Brahe yearbooks 1996 and 1997 are here supplemented with an article on reptile eggs which also reviews the situation with the birds.

The poikilothermic reptiles mostly bury their predominantly colour… Read More

The concept of causality in relation to vitalism

This hitherto unpublished part of the early work of Gerbert Grohmann (1897-1957) presents the philosophical contribution belonging to his doctoral thesis in natural sciences submitted in 1923 to the philosopher Hans Driesch (1867-1941) at the university of Leipzig, Germany.… Read More

Chronobiology is etheric research

Research on the etheric world easily leads to evasive methods: to chemically and physically controlled laboratory experiments on dead substances or to psychological formulation of the concepts. The first method tries to objectify the etheric world; the second subjectifies it. The etheric world, however… Read More

Hygiogenesis and salutogenesis - an attempt at a (necessary) differentiation of concepts

The concepts salutogenesis and hygiogenesis originate from different basic considerations. Hygiogenesis means a systematic representation of autonomous regulations in the sense of a therapeutic physiology. Salutogenesis, however, represents a system… Read More

The history and problem of the idea of evolution

The usual picture of the phylogenetic process is that there were first single-celled bacteria-like organisms followed by multicellular,»lower«and later»higher«, rather complex and differentiated forms of life. This succession of evolutionary changes has often been called»evolutionary… Read More

Concerning the evolutionary development of the blossom and fruit of the Ranunculaeeae

The fruit formation of the Ranunculaceae - evolutionarily early representatives of the angiosperms - is taken as a motif in examining the evolutiona1y path of the formation of both the angiosperm blossoms, exposed as they are to their surroundings, and… Read More

Correlation of the shapes of the shoot and leaf of annual dicotyledons

That the shape of a plant changes qualitatively and quantitatively during growth was noted as early as Aristotle. He tried to understand this process with the help of four»causes«(aitia) and four»rnotions«(kinesis). He thought that the formative force proceeds from… Read More