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Summary

The term tropism has been applied to almost every sort of reaction. It has been defined in some twenty different senses. There is so much diversity concerning its meaning that every one who wishes to convey anything but the vaguest sort of an idea finds it necessary to state in which sense he proposes to use it. This term has by some, also, been endowed with mystical causal powers. It would consequently be advisable to drop it altogether and substitute terms with more precise meanings. The following are suggested: negative or positive orientation or reaction, to light, gravity etc.; photo-, geo etc. negative or positive; or merely negative or positive reactions to light, gravity, chemicals etc.

Zusammenfassung

Der Ausdruck »Tropismus« ist so ziemlich auf jede Art von Reaktionen angewendet worden. Es gibt fÜr ihn eine so reiche Auswahl verschiedener Bedeutungen, da\ jeder, der mehr als nur die allervagste Andeutung eines Gedankens damit verbinden will, sich gezwungen sieht, festzulegen, in welchem Sinne er seinen Gebrauch vorschlägt. Dieser Terminus ist auch von einigen mit geheimnisvollen ursächlichen Kräften ausgestattet worden. Es wäre infolgedessen ratsam, ihn gänzlich fallen zu lassen, um dafÜr AusdrÜcke mit präziserer Bedeutung einzufÜhren. Wir bringen die folgenden in Vorschlag: »negative oder positive Orientierung oder Reaktion auf Licht, auf Schwerkraft usw.; Photo-, Geo-, negativ oder positiv«, oder einfach: »positive oder negative Reaktion auf Licht, Schwerkraft, Chemikalien usw.«.

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Mast, S.O. What are tropisms?. Archiv für Entwicklungsmechanik der Organismen 41, 251–263 (1915). https://doi.org/10.1007/BF02162895

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