Felix Plaut's oft-quoted monograph has at last been put into English. Though the translation is too literal, one feels grateful that it has been done at all. This important contribution and the conclusions derived therefrom, carried out in Wassermann's laboratory by a conscientious worker, should have great weight with us in arriving at a correct estimate of the value of this biologic test. Plaut's conclusions are practically those of other workers in the same field.
On account of their importance, we abstract a few of his summaries. In respect to the value of the Wassermann test in the diagnosis of syphilis, Plaut says that the positive reaction is an expression of the general luetic infection, and in consequence individuals reacting positively to this test are not free from syphilis. The reverse is by no means true, as persons in the latent tertiary stage may react negatively, and yet not be