<div class="htmlview paragraph">EXPERIMENTS that have been in progress since the 1929 Semi-Annual Meeting to measure the fatigue caused by an automobile ride, using the human body as a measuring instrument, and to predict there-from the possible effects of various types of spring-suspension, shock-absorber and other comfort-giving components are described. Initially, the problem was approached from the physiological standpoint because fatigue is definitely known to be a physiological phenomenon and, if the physiological changes are sufficiently marked to be measured, physiological tests are definite and quantitative.</div> <div class="htmlview paragraph">Changes in the human body are a good index of relative comfort, and, if the normal reactions of an individual or any group of individuals before a test are known, similar measurements at the end of a test or at the end of an automobile ride should show an appreciable difference. This difference, which the author claims is a direct measure of comfort, can be determined by measuring physical and nervous fatigue. For measuring the latter, number checking, speed of reaction, mental multiplication, steadiness of the hand and basal-metabolism rate tests were given; and, for the former, equilibrium tests using a wabblemeter were employed. Descriptions of various types of wabblemeter are included, and the results of the nervous-fatigue tests are presented.</div> <div class="htmlview paragraph">Plans for future development and study include (<i>a</i>) further improvement and standardization of two types of wabblemeter, (<i>b</i>) further standardization of the basal-metabolism test with particular attention to establishing a normal for different times of day, (<i>c</i>) improvement of the score card for reporting discomfort after the riding tests and (<i>d</i>) experiments with other new measuring devices. Further experimentation will include (<i>a</i>) investigation and application of tests to subjects in the laboratory, (<i>b</i>) study of tests on a large number of taxicab and motorcoach drivers and (<i>c</i>) application of the results with various outside groups of riders and test persons.</div> <div class="htmlview paragraph">In the discussion<span class="xref">*</span> the extraordinary importance and great value of the investigation was stressed. Much work remains to be done, according to the various speakers, some of whom suggested future tests.</div>