1. Thermal gradients as control factors for leaf size variations at different altitudes in mountains

   • A. N. Purohit
   • P. P. Dhyani

   OriginalPaper Pages: 3 - 26

2. Homology: A comparative or a historical concept?

   • Francisco Aboitiz

   Ideas in theoretical biology Pages: 27 - 29

3. Reviews

   BookReview Pages: 31 - 36

4. Organogenesis at the shoot apex: An attempt at modelization

   • Herve Le Guyader
   • Michel Ferre

   OriginalPaper Pages: 37 - 86