Our task now is to determine to what extent respiratory and digestive disorders, temperature fluctuations, loss of consciousness, etc., are related to intoxication and to what extent they can be attributed to infection. In our patients with urinary diseases, kidney function is usually impaired, generally due to lesions caused by the infection. Of course, there are also many cases that proceed aseptically for a long time, but it is rare for the aseptic condition to last until the end. In any case, the kidney is in a state of unstable equilibrium, and minor disturbances can significantly affect the excretion processes. This book on urinary tract diseases consists of clinical lectures from Hôpital Necker on semiology, diagnostics, pathology, and therapy, and is an invaluable resource.