TRYPANOSOMIASIS EXPEDITION TO THE CONGO 71 
4. That the parasites may come and go in the cerebro-spinal fluid as in the 
blood. 
5. That enormous numbers may appear in the blood without appearing in the 
cerebro-spinal fluid, and, to some extent, vice versa. 
6. That when trypanosom.es are present in the cerebro-spinal fluid its white 
cell elements are apt to be increased. 
7. That in cases where the parasites gain access to the cerebro-spinal fluid early 
in the disease, mania and other head symptoms are more likely to be prominent. 
A description of the various developmental forms of trypanosomes to be found 
in sleeping sickness cases in the cerebro-spinal fluid ; of the various cells of the 
fluid, in particular a peculiar large mulberry-shaped cell ; of its chemistry ; of certain 
large organisms with actively dancing particles, met with occasionally ; of the occur- 
rence of nematode larvae and ova resembling those of Ankylostoma duodenale in 
connexion with the fluid in many cases, and of other matters of interest, must be left 
for a future publication. 
