The elution profiles of aminoacyl transfer RNAs from Hodgkin's tumors have been compared with the corresponding patterns from normal splenic tissue. Aminohexyl-Sepharose and reversed-phase 5 chromatography have been used in the fractionation studies. Three peaks of acceptor activity have been observed in phenylalanyl, histidyl, aspartyl, and asparaginyl transfer RNAs. A second peak was shown in the case of tyrosyl and methionyl transfer RNAs. Seryl transfer RNA showed no change in elution profile; namely, a single species was observed in both normal and tumor transfer RNAs. These observations are confirmation that Hodgkin's disease is a malignant disease. The uniformity of the extra species of tRNA suggests that there is a commonly occurring aberration in the cell of origin of the Hodgkin's tumor.