1. The structure and optical behaviour of iridescent shells

   • C. V. Raman
   • D. Krishnamurti

   OriginalPaper Pages: 1 - 13

2. Thiophenes and thiapyrans

   • V. V. Ghaisas
   • B. D. Tilak

   OriginalPaper Pages: 14 - 19

3. Investigation of the degree of perfection of a crystal by means of polarized X-rays

   • S. Ramaseshan
   • G. N. Ramachandran

   OriginalPaper Pages: 20 - 30

4. The relation between magneto-optic rotation and optical dispersion in some halogen acids and their salts

   • V. Sivaramakrishnan

   OriginalPaper Pages: 31 - 40

5. Substitutes for the Zimmermann-Reinhardt reagent in the determination of iron in hæmatite and magnetite ores

   • K. M. Somasundaram
   • C. V. Suryanarayana

   OriginalPaper Pages: 41 - 44

6. A synthesis of carajurone hydrochloride

   • L. Ponniah
   • T. R. Seshadri

   OriginalPaper Pages: 45 - 52

7. Manganiferous micas from Madhya Pradesh, India

   • Sripadrao Kilpady
   • A. S. Dave

   OriginalPaper Pages: 53 - 63