Several installments of this atlas have been published. Three of these were reviewed in The Journal ( May 9, 1953, page 199; Feb. 19, 1955, page 690; and Oct. 6, 1956, page 616). The current release deals with brucellosis, plague, yellow fever, rabies, leishmaniasis, schistosomiasis, filariasis, and the distribution of the population in Central and South America. The quality of the maps and text is, as usual, excellent. The loose-leaf feature will permit the individual replacement of maps that become obsolete. Those who have the earlier issues will undoubtedly wish to add the new maps, and those who are not familiar with this important epidemiologic work may wish to make its acquaintance.