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Das aus siedend gesättigter wässeriger Lösung umkristallisierte, zwischen Filtrierpapier an der Luft getrocknete Ferrocyankalium zeigt normalen Wassergehalt, wenn nur bei der indirekten Wasserbestimmung fur möglichst geringe relative Oberflächenentwicklung gesorgt wird.

Breaking-off of crown parts and large branches is a common type of tree failure and can result in substantial damage to objects and persons. The trees are often irreversibly damaged as well. Reasons for this type of failure are usually included bark in forks and decay or cracks in branches. As an alternative to topping or felling hazard trees, a tree crown stabilization system was developed for the protection of crowns endangered by possible failure. The System Osnabriick consists of at least two double belts, each strapped around the stem or branch and connected by wire cables. Wood-biological investigations on beech trees with six-year-old double-belt systems showed that neither discoloration nor fungal attack occurred in the wood and bark under the belts. The cambium beneath the belts apparently was not impaired either. The double-belt system makes it possible to maintain old trees with severe defects in urban areas by safeguarding their natural crown architecture as well as providing maximum safety to the public.

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