The Indian National Science Academy was established in January 1935 with the objective of promoting science in India and harnessing scientific knowledge for the cause of humanity and national welfare. In 1968 it was designated as the adhering organisation in India to the International Council for Scientific Union (ICSU) on behalf of the Government of India. Over the years, the Academy has published a number of journals, volumes, biographical memoirs, etc. The year 20092010 will be specially celebrated to mark the Platinum Jubilee of the Academy. Many programmes are planned in different centres in India on this occasion. In addition, the Academy has decided to publish a number of special volumes on different s- jects ranging from earth sciences to life sciences. This volume is on Physics and Chemistry of the Earths Interior. One of the main objectives of geophysicists is to establish the internal structure of the earth as revealed by seismic tomography. It is also their primary goal to correlate geophy- cal data to reveal thermal and chemical state of the crust, mantle and core of the earth. In - der to interpret seismic velocities and associated density and elastic properties in terms of mineralogical and petrological models of the earths interior, thermodynamic and hi- pressure temperature data from mineral physics are essential. With the advent of different types of multi-anvil and laser-heated diamond anvil equipment, it is now possible to simulate conditions prevalent even in the lower mantle and core of the earth.

Geophysical and Experimental Petrological Studies of the Earths Interior.- Modelling of Metamorphic Textures with C-Space: Evidence of Pan-African High-grade Reworking in the Eastern Ghats Belt, India.- Orogenic Processes in Collisional Tectonics with Special Reference to the Himalayan Mountain Chain: A Review of Theoretical and Experimental Models.- Some Remarks on Melting and Extreme Metamorphism of Crustal Rocks.- Closure Temperature, Cooling Age and High Temperature Thermochronology.- Thermobarometry Gone Astray.- On Fluids in the Dynamic Earth.- Laboratory Measurements of Ultrasonic Wave Velocities of Crustal Rocks at High Pressures and Temperatures: Petrological Structure of Izu-Bonin-Mariana Arc Crust.- Seismic Imaging of the Mantle Discontinuities Beneath India: From Archean Cratons to Himalayan Subduction Zone.- Models for Constraining Thermal Structure of the Indian Crust.- Convection in the Earths Mantle.- Post-perovskite Phase: Findings, Structure and Property.