* 
i 
U. 
215 
Finally, I should like to express my gratitude to Andrew Smith for his painstaking English 
translation of this work. 
A scientific project is always an enriching experience for the research worker. This pro- 
ject meant a iot more to me: it afforded me pieasure in the beauty of the material, in the 
art of the designer, in the perfection of the execution - it provided aesthetic enjoyment. 
Vienna, August 1985 
Waltraud Neuwirth 
11