1. Reflections on method: Theodor Boveri's evaluation of “natural experiments” and their table-top simulation

   • Klaus Sander

   Essay Pages: 313 - 315

2. Proteoglycans with affinity for the neuralizing factor and the vegetalizing factor (activin A homologue)

   • Hildegard Tiedemann
   • Jochen Born
   • Heinz Tiedemann

   Original Articles Pages: 316 - 320

3. Morphological aspects of fertilization in Phallusia (Ascidia) nigra (Ascidiacea, Tunicata)

   • Makoto Fukumoto

   Original Articles Pages: 321 - 328

4. Organogenesis in the leech: development of nephridia, bladders and their innervation

   • Angela Wenning
   • Mary Anne Cahill
   • Ursula Kaltenhäuser

   Original Articles Pages: 329 - 340

5. Drosophila glial architecture and development: analysis using a collection of new cell-specific markers

   • Heidi B. Nelson
   • Allen Laughon

   Original Articles Pages: 341 - 354

6. Differential expression of type II cytokeratin mRNA defines early developmental boundaries within the ectoderm, mesoderm and endoderm during chick development

   • Jonathan J. Henry
   • Timothy S. Charlebois
   • Robert M. Grainger

   Original Articles Pages: 355 - 363

7. Thrombomodulin distribution during murine development

   • Virginia A. Ford
   • John E. Wilkinson
   • Stephen J. Kennel

   Original Articles Pages: 364 - 370

8. A late role for a subset of neurogenic genes to limit sensory precursor recruitments in Drosophila embryos

   • Rolf Bodmer
   • Lily Yeh Jan
   • Yuh-Nung Jan

   Original Articles Pages: 371 - 381

9. Acknowledgement to referees

   Legacy Pages: 383 - 383