1. Theoretical calculation of electric dipole moments for conjugated systems

   • R. D. Brown
   • B. A. W. Coller

   Commentationes Pages: 259 - 282

2. Non self-consistent field theory

   • T. K. Lim
   • M. A. Whitehead

   Commentationes Pages: 283 - 289

3. Model two-electron chemical bonds and the concept of electronegativity

   • M. J. Feinberg
   • T. E. Haas

   Commentationes Pages: 290 - 304

4. Molecular geometry and electronic structure of chlorosubstituted trans- and cis-stilbene derivatives

   • Giorgio Favini
   • Salvatore Trovato
   • Aldo Gamba

   Commentationes Pages: 305 - 312

5. Low temperature absorption spectra of KMnO₄ in KClo₄

   • Smith L. Holt
   • C. J. Ballhausen

   Commentationes Pages: 313 - 320

6. Influence de la liaison hydrogène intramoléculaire sur les bandes π → π ^* de certaines molécules organiques. Théorie électronique

   • E. Razafindrakoto
   • S. Besnainou

   Commentationes Pages: 321 - 327

7. A theory of the optical properties of vitamin B ₁₂ and its derivatives

   • Peter Day

   Commentationes Pages: 328 - 341

8. Sigma-polarization in 5-membered heterocyclic ring systems

   • Waldemar Adam
   • Alec Grimison

   Commentationes Pages: 342 - 351

9. A semiempirical approach to hyperconjugation and application to toluene, the xylenes and mesitylene

   • Peter Lindner
   • Olle Mårtensson

   Relatio Pages: 352 - 355

10. Recensiones

    • Ralph G. Pearson
    • W. H. E. Schwarz

    BookReview Pages: 356 - 358