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1the amount absorbed bears to that unabsorbed. Thirdly, it follows from the second conclusion that the actual amount of complement which is used in the reaction is not important within limits, except as it affects the slope of the plotted logarithmic curve. This gives a method susceptible of considerable accuracy for the comparison of any unknown syphilitic serum or spinal fluid with a standard syphilitic serum which has previously1 been shown to be indefinitely preservable by appropriate technic.

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The examination of the brain by the histological methods of Hiessl and Alzhiemer for the recognition of progressive paralysis is inaccessible to the practical doctor, why Stiefler (Mnch. m. Woch., 1923, No. 22) warmly recommends the witty histo-chemical method of Spatz.