RT Journal T1 L'electro-diagnostic. JF Journal of the American Medical Association JO Journal of the American Medical Association YR 1929 FD April 13 VO 92 IS 15 SP 1297 OP 1297 DO 10.1001/jama.1929.02700410067039 UL http://dx.doi.org/10.1001/jama.1929.02700410067039 AB This monograph, one in the series of books on modern physical therapy, gives a concise and practical account of classic as well as modern electrodiagnosis. The first part presents the old method apparatus, the technic, the physiologic effects of the galvanic and faradic current, the abnormal electrical reactions, the voltaic vertigo. One can follow the progress accomplished since Duchenne, the father of electrodiagnosis: the addition of the galvanic to the faradic test, the substitution of the bipolar for the unipolar test. The qualitative changes and observations on the reaction of degeneration are clearly presented. The second part deals with the new method, based on the time factor in response, called the chronaxie, and with the researches for its measuring and with its study from the physiologic and pathologic points of view. The valuable tables of Bourguignon are presented. Duhem corroborates the opinion of the leading investigators that, in the majority