. The Journal of laboratory and clinical medicine . iscosity of , the other of refractoviscosimetric quotient is 300 in the first sample and 333 in thesecond; the higher the quotient the lower the viscous poAver of a certaincolloid substance. *Received for publication, March 18, in Medicine, Mayo Foundation. 733 734 THE JOURXAL OF LABORATORY AND CLINICAL MEDICINE The normal range in each condition is represented by a shaded field inthe chart. This range is based on a combination of my findings and thosementioned in the literature.^ ^ It should be stated especially tha
. The Journal of laboratory and clinical medicine . iscosity of , the other of refractoviscosimetric quotient is 300 in the first sample and 333 in thesecond; the higher the quotient the lower the viscous poAver of a certaincolloid substance. *Received for publication, March 18, in Medicine, Mayo Foundation. 733 734 THE JOURXAL OF LABORATORY AND CLINICAL MEDICINE The normal range in each condition is represented by a shaded field inthe chart. This range is based on a combination of my findings and thosementioned in the literature.^ ^ It should be stated especially that the upperand lower limits are not absolutely sharp. The height of the black columnsindicates the number of cases. DISCUSSION The viscosity is normal in arrested eases in Group 1. Although the otherthree groups comprise cases in which the viscosity is normal, there is amarked preponderance of cases in which the viscosity is high. In the pro- P-ifraetlvltj Glottain persairtafa ?. quotlMt lilt iiioooooooo s^lj^BS CS. H~^SiK Fig. 1. gressive stage of the disease (Group 4) the viscosity is greatly one-half of all the serums of this group have a viscosity between A viscosity of , , and even of , as found in severalinstances, is to be considered as exceptionally high. Such degrees of viscositywere not observed in the great number of determinations made during thepast year in other diseases. It is also worthy of note that in the few casesof Group 4 in which the viscosity was normal, the refractivity was extremelylow. A viscosity of from to under usual conditions would correspondto such low refractive indexes. If, therefore, a viscosity of from is found, this normal viscosity is very much elevated. The refractivity of tuberculous serum is normal in most cases. The field REFRACTO-VISCOSIMETRIC PROPERTIES OF BLOOD SERUM 735 between 54 and 64 (Pulfrich units) corresponds, according to Reiss,
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