1. Hans Driesch's “philosophy really ab ovo”, or why to be a vitalist

   • Klaus Sander

   Essay Pages: 1 - 3

2. Expression and distribution of SPARC in early Xenopus laevis embryos

   • Maurice Ringuette
   • Thomas Drysdale
   • Fina Liu

   Original articles Pages: 4 - 9

3. The role of eggshell and underlying vitelline membrane for normal pattern formation in the early C. elegans embryo

   • Einhard Schierenberg
   • Bernd Junkersdorf

   Original articles Pages: 10 - 16

4. Embryogenesis in C. elegans after elimination of individual blastomeres or induced alteration of the cell division order

   • Bernd Junkersdorf
   • Einhard Schierenberg

   Original articles Pages: 17 - 22

5. The response of Drosophila imaginal disc cell lines to ecdysteroids

   • David J. Peel
   • Martin J. Milner

   Original articles Pages: 23 - 35

6. Cell lineage studies in the crayfish Cherax destructor (Crustacea, Decapoda) : germ band formation, segmentation, and early neurogenesis

   • Gerhard Scholtz

   Original articles Pages: 36 - 48

7. Second-site modifiers of the Delta wing phenotype in Drosophila melanogaster

   • Thomas Klein
   • Jose A. Campos-Ortega

   Original articles Pages: 49 - 60

8. Differential susceptibility of early steps in carp (Cyrinus carpio) development to α-amanitin

   • H.W.J. Stroband
   • G. te Krounie
   • W. van Gestel

   Short communication Pages: 61 - 65