184 OCCUPATIONAL TUMORS AND ALLIED DISEASES XVII.

ii 500 OCCUPATIONAL TUMORS AND ALLIED DISEASES appreciable increase in the proportion of the malignant neoplasms, as is evident from the following evaluation of 62 instances collected from the European literature: Years Benign tumors Malignant tumors 20-30 1 o 3J-40 2 6 4I~5 3 22 5I~So 2 29 61-jo 0 7 As the European tumor of this type usually is not discovered during an early developmental stage, these figures suggest the possibility that some of the benign tumors undergo malignant transformation at some point in their course and thereby increase the proportion of malignant tumors in the older age groups.

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