RT Journal T1 MEthoden der virusforschung JF Journal of the American Medical Association JO Journal of the American Medical Association YR 1939 FD October 28 VO 113 IS 18 SP 1665 OP 1665 DO 10.1001/jama.1939.02800430057030 UL http://dx.doi.org/10.1001/jama.1939.02800430057030 AB This volume has an attractive format and contains excellent subject and author indexes. Almost half the text describes the technics of investigations of plant viruses; the remainder gives most of the procedures involved in studies on viruses derived from man and the lower animals, including those of the rickettsial diseases and pleuropneumonia bovum. At the end of each section are numerous references which add definite value. Of the authors, da Rocha-Lima has the respect and esteem of his colleagues for his original contributions to the subject of rickettsiae, particularly those associated with typhus fever, and Reis has studied avian and virus pathology. Silberschmidt is engaged in investigations on plant viruses, especially the study of the immunologic reactions of plants to infection. Within the last eleven years a number of comprehensive treatises dealing with the general aspects of viral agents and the diseases induced by them have been presented to the