Item is a videocassette of a guest lecture by Dr. C.M. Parkes, which was given as part of the Friday at Four lecture series. This lecture series sponsored and organized by the Dalhousie Medical School and focused on a variety of subjects by lecturers invited to speak about specialized areas of medicine. The lectures were held each Friday by the School from the 1970s to the 1990s. This video was requested by Dr. Paterson from the Department of Family Medicine.