1. Quantitative aspects of RNA synthesis in normal and lithium-treated embryos ofXenopus laevis

   • Jeremy Osborn
   • Robert Wall
   • Martin Stanisstreet

   OriginalPaper Pages: 269 - 282

2. RNA and protein synthesis in developing embryos ofSmittia spec. (Chironomidae, Diptera)

   • Herbert Jäckle
   • Klaus Kalthoff

   OriginalPaper Pages: 283 - 305

3. Assessment of cell proportions during regeneration ofDileptus anser (Ciliata)

   • Krystyna Golinska

   OriginalPaper Pages: 307 - 321

4. Morphogenetic substances in nerve-depletedhydra

   • H. Chica Schaller
   • Cornelis J. P. Grimmelikhuijzen
   • Hans Bode

   OriginalPaper Pages: 323 - 328

5. A comparative ultrastructural study of ‘glue’ production and secretion of the salivary glands in different species of theDrosophila melanogaster group

   • G. N. Thomopoulos
   • C. D. Kastritsis

   OriginalPaper Pages: 329 - 354

6. Development ofDentalium following removal of D-quadrant blastomeres at successive cleavage stages

   • James Newton Cather
   • Nicolaas Hendrikus Verdonk

   OriginalPaper Pages: 355 - 366

7. Age specific cell sorting within aggregates of chick neural retina cells

   • Richard Burt
   • Alfred Gierer

   OriginalPaper Pages: 367 - 373

8. Early development of the thoracic discs ofDrosophila

   • Peter A. Lawrence
   • Gines Morata

   Short Commnication Pages: 375 - 379