argon becomes, since, for argon, T greatly exceeds Θ$_{E}$, As is seen in Fig. 2 (Fig. 4 of the forthcoming Bulletin article), Eq. (6) gives a reasonably good description of the heat capacity. The heat capacity is a second derivative of the free energy and is difficult to obtain accurately in a theory. The experimental heat capacity becomes infinite at the critical point. Equation (6) does not predict this. Much has been made of this failure. However, it should be kept in mind that no simple theory predicts the singularity of the heat capacity at the critical point. Some are less successful than Eq. (6). For example, the augmented van der Waals theory (a widely accepted theory) gives the prediction C = 3 Nk/ 2. Later Eyring grafted the renormalization group approach onto Eq. (5) to obtain the singularity. However, I find this artificial. I collaborated with him in his study of liquids by applying the significant structure to liquid hydrogen. I also assisted in the writing of the book, Statistical Mechanics and Dynamics by Eyring, myself, Betsy Stover, and Ted Eyring. This book was an outgrowth of the lecture notes prepared by one his first students at Utah, Marilyn Alder. These notes were mimeographed and bound with a yellow cover and was referred to by students as the yellow peril . The book was rather unique in that the first chapter covered the field in an informal way and then the material was repeated more formally in the subsequent chapters. Needless to say, significant structure theory was included in one of the chapters. This book was moderately successful. With Jost, he and I collaborated on a multi-volume treatise on physical chemistry. During his final years, he became interested in cancer both because of Mildred’s illness and because of the cancer that ultimately took his life. Betsy Stover came to him with the observation that the mortality curves of the experimental animals that had been exposed to radiation that caused them to die of bone cancer were striking similar to a Fermi-Dirac distribution. This suggested to Eyring that this was similar to saturation in adsorption and the rate of mutation that was responsible for the cancer was proportional to the product of the fraction of normal cells multiplied by the fraction of mutated cells. He and Stover wrote several papers under the general title of the Dynamics of Life that were based on this idea. 8 C Nk = 3 V$_{s}$ V + 3 2 V − V$_{s}$ V . (6)