1. Clay as a philosopher

   • G. Mannoury

   OriginalPaper Pages: 1 - 2

2. Clay's work on cosmic rays

   • H. den Hartog

   OriginalPaper Pages: 3 - 5

3. Reality, science, and metaphysics

   • C. J. Ducasse

   OriginalPaper Pages: 9 - 21

4. Report on the last years of Isotype work

   • Marie L. Neurath

   OriginalPaper Pages: 22 - 27

5. Introduction to the philosophy of physical science, on the basis of logical empiricism

   • Philipp Frank

   OriginalPaper Pages: 28 - 45

6. Langage, Mathematiques Et Observables

   • Pius Servien

   OriginalPaper Pages: 49 - 53

7. Ideal- Und Realtypen Der Planwirtschaft

   • Emil J. Walter

   OriginalPaper Pages: 54 - 64

8. Remarks on two chapters of Laotse's Tao Teh Ching

   • Axel L. Stern

   OriginalPaper Pages: 65 - 69

9. Contingency

   • Justus Meyer

   OriginalPaper Pages: 73 - 90

10. Book review

    • Norman M. Martin

    BookReview Pages: 93 - 94

11. Inaugural address and general survey of the programme

    • P. H. Esser

    Report Pages: 101 - 107

12. Words of greeting by the burgomaster of 's-Graveland

    • Count Schimmelpenninck

    OriginalPaper Pages: 108 - 108

13. Introduction a l'etude de langages microscopiques

    • G. Mannoury

    OriginalPaper Pages: 111 - 112

14. Systemes microscopiques et langage microphysique

    • Paulette Destouches-Fevrier

    OriginalPaper Pages: 113 - 119

15. Differents niveaux d'intersubjectivite du langage

    • Louis Rougier

    OriginalPaper Pages: 120 - 129

16. Le langage des sciences

    • Pius Servien

    OriginalPaper Pages: 130 - 133

17. Metarelation und Kalkuelengenetik

    • David L. Szekely

    OriginalPaper Pages: 134 - 147

18. Das A-B-C der Sprache und das A-B-C der Gedanken

    • Franz Denk

    OriginalPaper Pages: 148 - 154

19. Problemes psycho-linguistiques en physique moderne

    • Jean-Louis Destouches

    OriginalPaper Pages: 155 - 166

20. Über die Verständlichkeit formalisierter Sprachen

    • Wilhelm Britzelmayr

    OriginalPaper Pages: 167 - 171

21. Gradation of language in biological systematics

    • W. M. Kruseman

    OriginalPaper Pages: 175 - 181

22. Mathematical biophysics, cybernetics and significs

    • Anatol Rapoport

    OriginalPaper Pages: 182 - 193

23. An analysis of some concepts and terms in vegetation study or phytocenology

    • V. Westhoff

    OriginalPaper Pages: 194 - 206

24. Objet et methode de la science juridique

    • Henri Levy-Bruhl

    OriginalPaper Pages: 209 - 212

25. Collective guilt

    • N. Westendorp Boerma

    OriginalPaper Pages: 213 - 221

26. La methode empirique en sociologie

    • Georges Bourgin

    OriginalPaper Pages: 222 - 224

27. The fight against revelation in semantical studies

    • Herman Tönnessen

    OriginalPaper Pages: 225 - 234

28. In defence of non-metaphysical ethics

    • Axel L. Stern

    OriginalPaper Pages: 235 - 237

29. Is it possible to verify statements by non-verbal testing methods?

    • P. H. Esser

    OriginalPaper Pages: 238 - 242

30. Final address

    • P. H. Esser

    Report Pages: 243 - 246

31. The operational aspect of meaning

    • P. W. Bridgman

    OriginalPaper Pages: 251 - 259

32. Report on recent developments in the philosophy of quantum mechanics

    • Henry Margenau
    • John Compton

    OriginalPaper Pages: 260 - 271

33. Qu'est-ce que la philosophie?

    • C. J. Ducasse

    OriginalPaper Pages: 272 - 286

34. Logic and experience

    • Kazimierz Ajdukiewicz

    OriginalPaper Pages: 289 - 299

35. The pragmatic foundations of semantics

    • Andrzej Grzegorczyk

    OriginalPaper Pages: 300 - 324

36. Book reviews

    • Tadeusz Kotarbinski

    BookReview Pages: 325 - 327

37. P. W. Bridgman, in revolt against formalism

    • Jeremy Bernstein

    OriginalPaper Pages: 331 - 341

38. Modern architecture and the symbols of statics

    • Josef Frank

    OriginalPaper Pages: 342 - 349

39. The institute for the unity of science essay Contest

    OriginalPaper Pages: 350 - 351

40. Hypothetical statements in phenomenalism

    • Robert Brown
    • John Watling

    OriginalPaper Pages: 355 - 366

41. Ueber das Verstehen

    • Josef Schächter

    OriginalPaper Pages: 367 - 384

42. (II. Teil) Individuum, Gesellschaft und Staat

    • Emil J. Walter

    OriginalPaper Pages: 385 - 399

43. Assemblee

    • Henri Levy-Bruhl

    OriginalPaper Pages: 400 - 406

44. Psychological hedonism

    • Wladyslaw Tatarkiewicz

    OriginalPaper Pages: 409 - 425

45. Book reviews

    • Norman M. Martin
    • B. H. Kazemier

    BookReview Pages: 429 - 431

46. Two cornerstones of empiricism

    • Gustav Bergmann

    OriginalPaper Pages: 435 - 452

47. In memoriam N. Westendorp Boerma

    • The dutch members of the general editorial committee

    Announcement Pages: 453 - 455

48. Carnap's foundation of probability theory

    • D. van Dantzig

    OriginalPaper Pages: 459 - 470

49. Combination of methods

    • J. Clay

    OriginalPaper Pages: 471 - 479

50. Formal systems and mental activity

    • B. H. Kazemier

    OriginalPaper Pages: 480 - 489