1. The momentum spectra of secondary particles in (π⁻,N)-interactions at 7 GeV

   • F. Lehar
   • V. PetrŽílka
   • M. Suk

   OriginalPaper Pages: 489 - 497

2. Cyclotron instabilities of a two-component electron plasma

   • K. Jungwirth

   OriginalPaper Pages: 498 - 505

3. Low-frequency instability of an inhomogeneous weakly ionized plasma in crossed electric and inhomogeneous magnetic fields

   • V. Kopecký

   OriginalPaper Pages: 506 - 515

4. Secondary electron emission from thin self-supporting films of silver

   • V. Malát

   OriginalPaper Pages: 516 - 520

5. Some results of experiments on discharges in shock tubes with parallel conductors

   • J. Kravárik

   OriginalPaper Pages: 521 - 526

6. The optimum image plane in an optical system with chromatic aberration

   • V. Blumová

   OriginalPaper Pages: 527 - 542

7. The thermoelectric efficiency of CdSb and solid solutions of Zn _x Cd_1−x Sb with hole conductivity

   • L. štourač

   OriginalPaper Pages: 543 - 551

8. Permittivity, dielectric loss and dc conductivity of NaNO₃ crystals grown by epitaxy

   • E. Mariani
   • J. Eckstein
   • E. Rubínová

   OriginalPaper Pages: 552 - 558

9. Domains in ferroelectric YMnO₃

   • M. šafránková
   • J. Fousek
   • S. A. KiŽaev

   Letters to the Editor Pages: 559 - 560

10. The influence of an ultrasonic field on the conductivity of AgCl crystals

    • E. VavŘinec

    Letters to the Editor Pages: 560 - 561

11. The determination of the refractivity index of CdS single crystals from interference maxima on the transmission curve in the region 0·5–1·3 Μm

    • L. Roskovcová
    • J. Pastrňák

    Letters to the Editor Pages: 562 - 564

12. The effective mass of conduction electrons in the Bi₂(Te, Se)₃ system from reflectivity measurements

    • M. Závětová
    • A. Vaško

    Letters to the Editor Pages: 565 - 566

13. Professor Antonín Vašíček

    • J. Kučírek

    Reports Pages: 567 - 571

14. New books

    BookReview Pages: 571 - 572