Contents: The conductivity of an ionized gas in a magnetic field; Some properties of a hydrogen plasma; The statistical mechanics of the approach to equilibrium in gases; Irreversible processes in a plasma: Effect of long range forces; Relaxation processes in plasma; Some solutions of the macroscopic equations of magnetohydrodynamics; A microscopic analysis of magneto-gas-dynamics; Magnetohydrodynamics in the limit of small inertial forces; Axially symmetric hydromagnetic channel flow; Experimental studies on plasma dynamics; Applied magnetohydrodynamics at Avco-Everett Research Laboratory; Techniques for producing plasma jets; Electromagnetic shock tubes; Optimum power generation using a plasma as the working fluid; Space propulsion engines--a problem in production of high velocity gases; The electromagnetic pinch effect for space propulsion; Plasma acceleration by guided microwaves; Considerations in the design of a steady DC plasma accelerator.