1 hough universally recognised as a very potent factor in the causation of certain wellknown diseases such as aneurysm, Stokes Adams' syndrome, certain forms of meningitis, hemiplegia, etc., syphilis of the circulatory system is not by any means universally understood by the medical profession. It is, therefore, a great pleasure to read the lucid exposition of the subject by Dr. Ivy Mackenzie, ...