1. Entelechy and the ontogenetic machine — work and views of Hans Driesch from 1895 to 1910

   • Klaus Sander

   Essay Pages: 67 - 69

2. Arachidonic acid and the control of body pattern inHydra

   • Werner A. Müller
   • Thomas Leitz
   • Wolf D. Lehmann

   Original Articles Pages: 70 - 76

3. Actin genes expressed during early development ofPatella vulgata

   • André E. van Loon
   • Hans J. Goedemans
   • Jo A. M. van den Biggelaar

   Original Articles Pages: 77 - 84

4. An ultrastructural and developmental analysis of the corpus allatum of juvenile hormone deficient mutants ofDrosophila melanogaster

   • Ji-da Dai
   • Lawrence I. Gilbert

   Original Articles Pages: 85 - 94

5. Flight muscle formation inDrosophila mosaics: requirement for normalshibire function of endocytosis

   • Margaret Raper Hummon
   • Walter J. Costello

   Original Articles Pages: 95 - 102

6. Role of cell interactions in ascidian muscle and pigment cell specification

   • William R. Jeffery

   Original Articles Pages: 103 - 111

7. Tracing neurons with a kinesin-β-galactosidase fusion protein

   • Edward Giniger
   • William Wells
   • Yuh Nung Jan

   Original Articles Pages: 112 - 122

8. Cytoplasmic actin A3 gene promoter injected as supercoiled plasmid is transiently active inBombyx mori embryonic vitellophages

   • Madeleine Coulon-Bublex
   • Nicole Mounier
   • Jean Claude Prudhomme

   Short Communication Pages: 123 - 127