1. Antimicrobial activities of essential oils

   • A. M. Janssen
   • J. J. C. Scheffer
   • A. Baerheim Svendsen

   Review Articles Pages: 193 - 197

2. Polarographic determination of extraction constants

   • H. A. Dingjan
   • W. P. Van Bennekom
   • A. Bult

   Original Articles Pages: 198 - 202

3. Analytical studies on illicit heroin

   • Henk Huizer

   Original Articles Pages: 203 - 211

4. Abstracts of Dutch doctoral theses

   • B. A. M. Van Schaik

   Abstract Pages: 212 - 213

5. Abstracts of main lectures

   • V. E. Tyler
   • J. van der Greef
   • R. Häneal

   Abstract Pages: 214 - 215

6. Abstracts of short lectures

   • H. W. Rauwald
   • J. Conner
   • G. Zogg

   Abstract Pages: 215 - 248