Liverpool Tropical School

form of "spirillar or spirochetal fever and the well-known European relapsing fever which is due to the S. Obervneirei. Koch had drawn attention to the small number ot parasites in the blood of tick fever cases as contrasted witli the numbers present in cases of relapsing fever Moreover, the attacks and the relapses are of longer duration in the Euiopean fever. The four cases here quoted were all due to infection of the experimenters while working in the Laboratory at Runcorn. We cannot find space to follow the full account