A brief resume of the previous work on pulpal reactions should be given at this time. Only one or two observations have been recorded. In 1925 and 1926 Dr. Milton C. Borman and I, during our internship at the Philadelphia General Hospital, made dental examinations of all tabetic and paretic patients in that institution. We found that in 94 per cent of these patients the pulps of the teeth showed marked abnormalities, ranging from hyperesthesia to anesthesia. Through the kindness of Dr. N. W. Winkelman and his laboratory staff at the Philadelphia General Hospital, sections of some of the pulps were made, and examination revealed the histologic changes which are found in other nerve tissue in neurosyphilis. The results of this work were published. 1 From 1927 to 1930 I secured some gasserian ganglions at postmortem examinations in the Philadelphia General Hospital. These specimens were from both syphilitic and nonsyphilitic