Nicole and Fitzgerald's assumption in 1932 that the Wassermann test had at last passed to rest in the limbo of historically interesting experiments can hardly be said to be correct, and the test still remains to-day as the standard method for the sero-diagnosis of syphilis. At the same time the steadily increasing specificity of flocculation tests and their value as ancillary procedures cannot be denied, and the accepted diagnostic ideal is a parallel examination by one of these and by the Wassermann test.