1. Wilhelm Roux's treatise on “qualitative” mitoses — a “classic” by either definition

   • Klaus Sander

   Essay Pages: 61 - 63

2. Function of trans-acting genes of theachaete-scute complex in sensory organ patterning in the mesonotum ofDrosophila

   • José Félix de Celis
   • Manuel Marí-Beffa
   • Antonio García-Bellido

   Original articles Pages: 64 - 76

3. The origin of the nascent blastocoele in preimplantation mouse embryos ultrastructural cytochemistry and effect of chloroquine

   • M. Aziz
   • H. Alexandre

   Original articles Pages: 77 - 85

4. Terminal differentiation of yolk-sac erythroid cells of the Syrian hamster in vitro

   • Kiyokazu Morioka
   • Reiko Minamikawa-Tachino

   Original articles Pages: 86 - 94

5. The eggshell ofDrosophlla melanogaster

   • Flora E. Zarani
   • Lukas H. Margarifs

   Original articles Pages: 95 - 103

6. Types of supernumerary outgrowths produced after inverting the dorsoventral limb axis of the anuranBufo bufo

   • P. Costaridis
   • S. Papageorgiou
   • C. Zafeiratos

   Short Communications Pages: 104 - 107

7. The sequential expression of tenascin mRNA in epithelium and mesenchyme during feather morphogenesis

   • Richard P. Tucker

   Short Communications Pages: 108 - 112

8. Localized distribution of a novel mesenchyme-specific antigen in developing chick digestive organs

   • Keiko Takiguchi-Hayashi
   • Sadao Yasugi

   Short Communications Pages: 113 - 116