The results of the above described experiments suggest that Abderhalden's reaction may be of use in the study of protozoal diseases.

In the case of East Coast Fever it is seen that in early stages of the disease only the lymphatic and suprarenal glands seem to be affected, whilst in later stages destruction of tissue takes place in practically all the organs, and this corresponds with the results of microscopical examinations of the various tissues.

Various experiments were performed with dogs infected with Babesia canis, but in most cases, owing to the presence of haemoglobin in the serum, the controls gave positive results as well as the organs + serum. The blood of a dog taken at the commencement of the infection was found to contain substances having a destroying action on liver tissue, but not on the other organs employed, whilst in later stages of the disease practically all the organs were affected.