200 
Arthropods as Hosts of Pathogenic Protozoa 
“While yellow fever is a communicable disease, it is not con¬ 
tagious in the ordinary acceptance of the term, but is spread by the 
infection of places and articles of bedding, clothing, and furniture.” 
Based upon this theory, houses, baggage, freight, even mail, 
were disinfected, and the most rigid quarantine regulations were 
enforced. The hardships to which people of the stricken regions 
were subjected and the financial losses are incalculable. And withal, 
the only efficient check upon the disease seemed to be the heavy frosts. 
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133. Culex sollicitans. Female (X 4 ). After Howard. 
It was found that for some reason, the epidemic abated with cold 
weather,—a measure beyond human control. 
It is not strange that among the multitude of theories advanced to 
explain the cause and method of dissemination of the disease there 
should be suggestions that yellow fever was transmitted by the 
mosquito. We have seen that Beauperthuy (1855) clearly urged 
this theory. 
More detailed, and of the greatest influence in the final solution 
of the problem were the arguments of Dr. Carlos Finlay, of Havana. 
In 1881, in a paper presented before the “Rea Academia de Cicncias 
M^dicas, Fisicis y Naturales dc la Habana,” he said: 
