RT Journal T1 CHemical and microscopical diagnosis. JF Journal of the American Medical Association JO Journal of the American Medical Association YR 1909 FD December 11 VO LIII IS 24 SP 2031 OP 2031 DO 10.1001/jama.1909.02550240077026 UL http://dx.doi.org/10.1001/jama.1909.02550240077026 AB In this second edition of his well-known book, the author has kept his text clear and concise and has eliminated many tests which have proved less accurate and valuable than those inserted in their place. Additional matter has been introduced on some of the new methods for determining the functional activity of the gastro-intestinal tract, especially noticeable being the desmoid reaction of Sahli and the nucleus test of Schmidt. In the chapter on the blood, few insertions are found and, indeed, few were needed, as this section was exceptionally complete in the first edition. The discussion of the Spirochœta pallida is, perhaps, somewhat limited, although it is becoming more and more probable that this organism may be only incidentally associated with syphilis. It is unfortunate that Wood has made no mention of the work of Ricketts on the causation and spread of Rocky Mountain fever, as this is not only