The high standard set by the Vaughans and Palmer in the first volume of their "Epidemiology and Public Health" has been maintained in the second. The volume before us deals with nutritional disorders, alimentary infections and diseases contracted through the skin. An attempt is made to group diseases according to the avenues through which the virus reaches and infects the body. This is a useful arrangement for the purposes of prevention and public health administration, but the authors evidently had trouble with the classification. The authors frankly admit the difficulties, for there are some epidemic diseases for which there is no specific virus, there are others in which the avenues of infection are multiple, and they might have added that there are a number about which our knowledge is inadequate. Any grouping will need rearrangement with increase in our knowledge of epidemic diseases, their causes and modes of transmission.