478 Proceedings of the Royal Physical Society. 
altitudes possible, in any case the second storey is preferable 
to the first, and in camp the ground should be disturbed as 
little as possible. Strictest disinfection should be employed. 
The water and food supply should be well cared for, and it 
should be remembered that the yellow-fever bacillus has 
been found in the soil. Exposure during the night is 
inadvisable, for Carlos Finlay has demonstrated that the 
disease can be communicated by the mosquito. Yellow 
fever is also a disease in which quarantine is necessary and 
effectual; not only is it necessary to place persons coming 
from an infected place under observation, but their clothing 
and goods should be thoroughly disinfected. 
Inoculation.—Since the researches of Freire and Finlay, it 
is possible to employ protective inoculation against yellow 
fever. Finlay allows a mosquito to bite a yellow-fever 
patient and then a healthy person; a mild attack of yellow 
fever is induced, protecting the person thus treated from a 
subsequent attack. Dr Freire, having isolated the yellow 
fever micro-organism by a series of cultivations, attenuates it 
and produces a fluid which almost entirely protects persons 
from yellow fever. In no case has the inoculation been 
harmful, and the mortality of those inoculated was only 
rather more than 0:4 per cent. in 10,881 cases inoculated 
(1890), showing that this procedure confers almost certain 
immunity from the disease. 
Treatment.—With regard to the treatment of yellow fever, 
little can be said. It is important that each patient should 
be allowed at least 2000 cubic feet of space; the room 
should be kept at an equable temperature, and the patient 
protected from draughts; indeed, many advise the treating 
the patients in tents or in the open air. Absolute rest in a 
recumbent position must be rigidly maintained. The patients 
must be lightly but warmly clothed, heavy blankets being 
avoided. Doctors and nurses should be cheerful, and en- 
courage the patients as much as possible. 
_ With regard to drugs, no specific for yellow fever is known, 
and, practically, symptoms must be treated. I should be 
inclined myself to recommend either of the two following 
treatments. The first is recommended by Nelson. He gives 
