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The author says in his preface that this work deals with diseases that for the most part are well known, even though there is still lively discussion concerning many of them. He also says that he approaches the subject as a clinician, as an "alter Krankenhausarzt." His aim is to present facts rather than theories. He admits that he is of a skeptical turn of mind and does not accept uncritically all that has been written about visceral syphilis. One sees that he has a knowledge of chemical and other laboratory aids to the diagnosis and understanding of this topic; but it is also clear that in the study of a case Schlesinger does not depend entirely on the van den Bergh test, or the Wassermann reaction, the sedimentation of the blood or on the roentgen ray. There is old fashioned reliance on the history, subjective symptoms, palpation and percussion.
Syphilis und innere Medizin.. Arch Intern Med (Chic). 1927;40(3):397. doi:10.1001/archinte.1927.00130090146012