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The article presents information on the morphogenesis of animal viruses. Rapid advances concerning the first two of these requirements, as they apply to animal viruses, have been registered during the past decade. The nature of the genomes of most, though not all, in the major groups of animal viruses is now known, at least as far as their size, form, and overall composition arc concerned. Similarly, the principal features of the polypeptide constitution of many groups of animal viruses have recently been elucidated, although marty details still remain to he filled in. Furthermore, a great deal of information has now accumulated concerning the replication of animal virus genomes and the synthesis of the structural components that comprise the shells that encapsidate them.