1. Oxygen consumption of normal and dwarf embryos ofXenopus laevis

   • Ulf Landström
   • Søren Løvtrup

   OriginalPaper Pages: 1 - 11

2. Observations on green pupae in Papilio machaon L. and Pieris brassicae L.

   • Brian O. C. Gardiner

   OriginalPaper Pages: 13 - 22

3. Developmental capacities of benign and malignant neoplasms ofDrosophila

   • E. Gateff
   • Howard A. Schneiderman

   OriginalPaper Pages: 23 - 65

4. Oriented migration of interstitial cells and nematocytes inHydra attenuata

   • Rosalind L. Herlands
   • Hans R. Bode

   OriginalPaper Pages: 67 - 88