The number of white blood cells, differential count of the white blood cells, absolute number of lymphocytes and the diameters of the lymphocytes were measured in 10 cases of infectious hepatitis, 10 cases of typhoid fever, 6 cases of tuberculous meningitis, 4 cases of pneumococcal pneumonia, 3 cases of lung abscess, 2 cases of septicemia and 10 healthy college students as normal control, and the following results were obtained.
1 The absolute number of lymphocytes were decreased in hepatitis (average: 1862) and typhoid fever (average: 1880), but in tuberculous meningitis, pneumonia, lung abscess and septilcemia they were mostly within the normal range.
2. The differential count percentage of small lymphocytes with 7.5 microne in tuberculous meningitis cases averaged about 31.8% and in pneumonia, lung abscess and septicemia about 30.8% but in hepatitis the average was 17.7%, in typhoid fever 26.2%. That indicated the definite decrease in small lymphocytes in hepatitis and typhoid fever. In hepatitis and typhoid fever the percentage of lymphocytes with diameters of more than 10 microne increased.
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