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The resistive properties of various tissues surrounding the heart were investigated in a number of living clogs. Alternating currents of a frequency varying between 10 and 10,000 e.p.s. have been used for this purpose. Technical problems associated with such measurements are analyzed. The results show that the resistive properties of most tissues are comparable and that the resistivity decreases slowly as the frequency increases.

The electric capacity of various tissues surrounding the heart has been investigated in living dogs, using frequency ranges from 10 to 10,000 c.p.s. Electrode polarization, a serious source of error in such measurements, has been corrected for. Discussion of our results and of resistivity data previously obtained in body tissues proves that the electric properties of body tissues are primarily resistive ones.

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1. Glomerulonephritis was produced in rabbits by the injection of antirabbit-kidney duck serum. 2. The clinical and pathologic characteristics of the disease are discussed. 3. It was found possible by appropriate means either to accelerate the development of the nephritis or to prevent its appearance entirely. 4. An apparent correlation was found between the development of the nephritis and the formation of antibodies to duck serum by the injected rabbit. 5. The generally accepted concept of the mechanism of the disease does not appear to be in accordance with the facts here observed. A new hypothesis is presented.