1. The physics of crystals

   • C. V. Raman

   OriginalPaper Pages: 327 - 335

2. On the intensity and polarisation of the light from the sky during twilight—Part II

   • J. V. Dave

   OriginalPaper Pages: 336 - 358

3. Mineralogy of some Indian clays

   • M. Ramakrishna Rao

   OriginalPaper Pages: 359 - 367

4. The role of solvent in chemical reactions

   • V. S. Padmanabhan

   OriginalPaper Pages: 368 - 382

5. Polarographic behaviour of metals in ethanolamines

   • R. S. Subrahmanya

   OriginalPaper Pages: 383 - 393

6. Variation with lunar phase of midday critical frequencies and heights of the F2 layer over Ahmedabad and other low latitude stations

   • K. M. Kotadia
   • K. R. Ramanathan

   OriginalPaper Pages: 394 - 399

7. Erratum

   • K. R. Ramanathan
   • R. V. Bhonsle
   • R. G. Rastogi

   Erratum Pages: 400 - 400