The Second International Cryogenic Materials Conference (ICMC) was held in Boulder, Colorado, in conjunction with the 1977 Cryogenic Engineering Con­ ference (CEC). Special thanks must be given to the University of Colorado for their skillful hosting of these two conferences. Collaboration between the two con­ ferences has been mutually beneficial, providing the materials special ist with insight into new applications and design concepts and the cryogenic engineer with exposure to modern materials accomplishments and potentials. The Proceedings of the 1977 Cryogenic Engineering Conference are published in Volume 23 of Advances in Cryogenic Engineering. Both conferences will be held again simul­ taneously in Madison, Wisconsin, in August