When the First World War ended, the political and economic system of prewar Europe lay in ruins. Though Allied politicians tried at various post war conferences to create a new and stable European order they failed because of conflicting and competing national interests. The peace settle ments neither established security from renewed attacks by the defeated nations nor did they lay the groundwork for a reconstruction of Europe's devastated economic system, because the members of the Allied war coali tion could not agree on the goals to be pursued by the treaties or on the means to enforce...

Most of the future increase in livestock production is expected to occur in the tropical and subtropical regions of the world. Cattle are the most numerous of the ruminant species in the tropics and provide the largest quantity of animal food products. More than one-third of the world's cattle are found in the tropics. Disease is the major factor which prohibits full utilization of these regions for cattle production. Various infectious and transmissible viral, rick ettsial, bacterial, and particularly protozoan and helminthic diseases, are widespread in the tropics and exert a heavy toll on...