1. On the elimination of short-period terms in second-order general planetary theory investigated by Hori's method

   • Jean Meffroy

   OriginalPaper Pages: 271 - 354

2. Planetary nebulae and Uhuru-2 catalog

   • J. H. Cahn

   Research Note Pages: 355 - 356

3. A method of computing the gravitational field of an axially symmetric flat galaxy

   • Mary M. Schaefer
   • Myron Lecar
   • George Rybicki

   OriginalPaper Pages: 357 - 372

4. On the disappearance of isolating integrals in dynamical systems with more than two degrees of freedom

   • C. Froeschlé
   • J. -P. Scheidecker

   OriginalPaper Pages: 373 - 386

5. A study of the force-field equation for the propagation of galactic cosmic rays

   • L. J. Gleeson
   • I. H. Urch

   OriginalPaper Pages: 387 - 404

6. Properties of the λ2200 Å interstellar absorber

   • J. Dorschner

   OriginalPaper Pages: 405 - 411

7. Giant elliptical galaxies: The Salpeter initial luminosity function and interstellar matter

   • A. J. Hillel

   OriginalPaper Pages: 413 - 432

8. Nova Delphini before the December 1967 maximum

   • M. Freidjung
   • I. Malakpur

   OriginalPaper Pages: 433 - 447

9. On the effect of fluctuating interstellar density on observed cosmic-ray intensities

   • J. R. Wayland

   OriginalPaper Pages: 449 - 456

10. Magnetically distorted polytropes

    • Dana F. Billings
    • Manohar Singh
    • S. K. Trehan

    OriginalPaper Pages: 457 - 469

11. Nonlinear perturbation theory for cosmic ray propagation in random magnetic fields

    • Heinrich J. Völk

    OriginalPaper Pages: 471 - 490

12. Abstracts of forthcoming papers

    Abstract Pages: 491 - 492