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The fourth edition of this work appeared in 1914. While the European war has curtailed progress in scientific lines, sufficient new material has developed to warrant changes in the book. Among the additional subjects which Dr. Webster has included are Petroff's method of obtaining cultures of tubercle bacilli; the Endameba gingivalis; the Bacillus rhinitis; Wolff-Junghans' test for gastric carcinoma; Wagner's "dry test" for occult blood; the phenoltetrachlorphthalein test of hepatic activity; the urease method for urea; Folin's new method for creatinin in urine; Benedict and Murlin's method for urea; Folin's new method for creatin in urine; Benedict and Murlin's method for amino acids in urine; Folin and Denis' microchemical methods for nonprotein nitrogen, urea and uric acid in the blood; the Schick diphtheria toxin reaction; Bronfenbrenner's modification of Abderhalden's test, and tests of blood before transfusion. The book shows throughout a careful revision of each section with the object of
Diagnostic Methods, Chemical, Bacteriological and Microscopical. A Text-Book for Students and Practitioners. JAMA. 1916;LXVI(19):1488. doi:10.1001/jama.1916.02580450054026
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