This book on Castellani's disease is based on sixty-six cases studied in Caracas. The work comprises four parts: the etiologic parasite; the disease itself; treatment, and case reports. The bibliography is not complete, and many if not most of the references are taken from The Journal. Among interesting points discussed are the frequency of bronchial spirochetosis in Caracas, staining and morphologic characteristics of the parasite, distribution and semeiology of the disease in Venezuela, and confirmation of the value of antimony and potassium tartrate in treatment. One noteworthy point is the high prevalence of the disease in Venezuela, Risquez having found it in 33 per cent, of 200 cases of tuberculosis taken at random. This book is a valuable contribution to a field which Latin American authors might do much toward widening and conquering.