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At its meeting on April 23, 1965 in Paris the Bureau of IUTAM decided to have a Symposium on the Irreversible Aspects of Continaum Mechanics held in June 1966 in Vienna. In addition, a Symposium on the Transfer of Physical Characteristics in Moving Fluids which, orig inally, had been scheduled to take place in Stockholm was rescheduled to be held in Vienna immediately following the Symposium on the Irre versible Aspects of Continuum Mechanics. It was felt that the subjects of the two symposia were so closely related that participants should be given an opportunity to attend both. Both decisions were unanimously approved by the members of the General Assembly of IUTAM. Prof. H. PARKUS, Vienna, was appointed Chairman of the Symposium on the Irreversible Aspects, and Prof. L. I. SEDOV, Moscow, was appointed Chairman of the Symposium on the Transfer of Physical Characteristics, with Prof. P ARKUS being re sponsible for the local organization of both symposia. In accordance with the policy set forth by IUTAM, membership of the Symposia was limited and by invitation only. Financial support for covering the costs of organization and for a partial defrayal of the accomodation and traveling expenses of the participants was provided by IUTAM and by the Austrian Ministry of Education.

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On Stress Waves in Viscoelastic Media Conducting Heat.- A Thermodynamic Approach to Rheology.- Thermodynamics and Wave Propagation in Non-Linear Materials with Memory.- On the Continuum as an Assemblage of Homogeneous Elements or States.- Joint Probability Density Distributions in a Turbulent Flow.- Accumulation of Second-Order Strain in Workhardening Media.- A Thermodynamic Development of Elastic-Plastic Continua.- Generalized Continuum Mechanics.- Phenomenological Aspects of Creep Irreversibility.- ?erenkov Generation of Thermal Waves for the Wave Equations of Thermo-Electro-Magneto-Elasticity.- On the Application of the Principles of Thermodynamics to Strained Solid Materials.- Finite Strain Elastic-Plastic Theory.- Application of Variational Methods in the Non-Linear Theory of Dispersive Wave Propagation.- Vibrational Dissociation Relaxation in a Multicomponent Mixture of Viscous Heat-Conducting Gases.- TIP Has Many Faces.- Transfer Phenomena in Fluid-Saturated Porous Media.- Couple-Stresses in the Theory of Thermoelasticity.- On Thermodynamics of the Differential Type Material.- The Notion of State and Its Implications in Thermodynamics of Inelastic Solids.- Composite Stress-Strain Relations for Elastoplastic Solids.- Kinetics of Creep and Creep Rupture.- The Influence of Dissipated Stresswork on the Rupture of Materials.- Variational Methods of Constructing Models of Continuous Media.- Irreversible Transition in Continuum Mechanics.- On Conditions of Yielding and Fracture for Viscoelastic-Plastic Bodies.- Thermodynamics for Beginners.- Thermomechanics of a Continuous System with Internal Structure.- Die Beeinflussung der Intensität des Transportprozesses durch das dynamische Verhalten der Phasengrenze Flüssigkeit-Gas oder Flüssigkeit-Dampf.- A Possible Generalization of Onsager´s Theory.

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