64 THOMPSON YATES LABORATORIES REPORT 
except two had an equal number of embryos in the blood both day and night : of the 
two exceptions, one showed a single parasite at night, none in the daytime ; the other a 
single parasite at the day examination, none at night. 
In spite of the small number of examinations and of their incompleteness, it 
is certainly evident from the above figures that the parasite does not agree in any 
way in its occurrence in the peripheral blood with either F. diurna or F. nocturna. 
It must however be noted that Thorpe describes the Friendly Islands as 'a hot- 
bed of elephantiasis.' This point will be referred to later. 
The following tables illustrate how the occurrence of embryos in the blood 
varies from day to day and week to week in the same cases. It must be here 
remarked, that the habits of the men whose blood was frequently examined for the 
purpose of the construction of these tables, were marked by extreme regularity 
They were government prisoners, kept in the government prison at Bonny. The 
men rose at five o'clock, were fed at eleven o'clock mid-day, and were locked up in 
their cells about eight o'clock ; from five till eleven and from twelve till six they 
were at work. 
In every case three drops of blood were examined under a three-quarter inch 
square cover glass. 
