Parathyroid hormone and vitamin D.

Along with many others of my generation at the Yale School of Medicine and the New Haven Hospital, I owe a great debt to Grover Powers as an inspiring teacher, friend, and benefactor. The invitation to give the Grover Powers lecture at Yale had a special emotional significance, therefore, and it is with a sense of great privilege that I address you this afternoon. I do not consider the primary purpose of this lecture as an occasion to honor Grover Powers. He has received so many honors under such important auspices that anything that I could add today would be relatively minor. The major purpose is to remind ourselves and succeeding classes of students at Yale of the great heritage which Grover Powers has given ushis teachings, counseling, and personal example which have contributed so much to the development of pediatrics in this country and to the emergence of the Yale University School of Medicine as an important influence in medical education and practice. In Osler's felicitous words, "The great possession of any university is its great names-not its wealth, nor the number of its schools but the men who have trodden in its service the thorny road through toil." Grover Powers is one of the great possessions of this school and his contributions continue to have relevance to the problems that we face today. One of the current preoccupations and concerns of members of clinical departments in our medical schools is the balancing of the importance of fundamental research against the responsibilities of the department for teaching and for the care of patients in the teaching hospital. This is not a new problem and I should like to remind you that within a relatively small department Grover Powers developed two major research laboratories: in electrolyte physiology under Daniel C. Darrow and in microbiology and immunology under James D. Trask. His department was noted for its devotion to the teaching of medical students and residents, and also of physicians in this