Spirochætes in the Brain in General Paralysis
1. (1) In a series of 50 cases of general paralysis spirochaetes were found in 62.5% of the brains.

2. (2) Spirochaetes are more likely to be found in the brain of recent acute cases than those which have run a long course, but—

3. (3) In 4 cases of juvenile general paresis whose ages ranged from 19 to 26 years at death, spirochaetes were found in the brain.

4. (4) In cases which had been treated by malaria or tryparsamide, spirochaetes were found in a much smaller percentage than in those untreated, and when present were not in such large numbers. As the number of treated cases was small, the statement requires further confirmation.

We are indebted to Mr. A. H. Fann, Senior Laboratory Assistant, for his share in the photographical and technical part of the work, and we beg to thank Dr. R. M. Clark, Medical Superintendent, under whose general supervision the work has been carried out, for permission to publish these results.