This Refresher Course was designed for college, university, and high school teachers, and for graduate students. In addition to the papers printed below, it included a representative motion picture prepared under the direction of Dr. John F. Kessel, Filariasis in Tahiti, an informal evening panel discussion, and a Demonstration Session at which 38 demonstrations were presented which stressed sources of material, technics, experiments, etc. which could be used in teaching parasitology. Modern parasitology began about the middle of the 19th century. About 6,800 species of parasitic protozoa had been described by 1958, about 5,100 of trematodes by 1951, about 2,000 of cestodes by 1951, and about 10,000 of nematodes by 1955. Parasites cause a loss of about $1,000,000,000 per year to the livestock industry in the United States. Human parasites are especially important in the developing countries of the tropics and subtropics. Many parasites are transmissible between man and other animals; the diseases they cause are zoonoses. Parasitology is that branch of ecology in which the environment is the host, and recognition of this fact is essential to a proper understanding of host-parasite relations. A list of recent text and reference books in English is given.