16,6 Haughwout et al.: Protozoal Dysentery 637 
or tenesmus. His bowels moved eight times. Five of these 
movements were reported by the nurse as being watery, one 
“resembled condensed milk,” and two were soft and feculent. It 
is to be regretted that none of these was saved for examination. 
The dose of benzyl benzoate was increased to fifteen drops, 
three times a day, on January 15. On January 17 the patient’s 
bowels moved twice. The first stool, passed at 7 o’clock in the 
morning, was yellow, watery, and feculent. No blood or cel- 
lular debris was found. It contained numerous active balan- 
tidia. The second stool was passed at 9.30 a. m. It was yellow 
and semiformed and, like the earlier specimen, contained no 
tissue elements. A few sluggish balantidia were found; also 
numerous ova of hookworm and Tricimris. The latter contin- 
ued to appear regularly up to the time of the patient’s death. 
Both helminthal infections were very heavy. 
The patient passed only one stool the following day, and it 
was not saved for examination. His general condition was 
much improved in every way. As he seemed to tolerate the 
drug well, the dose of benzyl benzoate was raised to twenty 
drops three times a day on January 19. His bowels moved 
once, but the specimen sent to the laboratory was unfit for 
examination, so no stress can be laid on our failure to find 
parasites on that day. A few vigorous balantidia were found 
the next day, however, and on January 21, notwithstanding the 
patient was eating and sleeping well, his stool, which was soft 
and yellow, contained traces of mucus and swarms of healthy- 
looking, vigorous balantidia. The parasites appeared to be as 
numerous as they were at the height of the acute stage of the 
infection and their increase in numbers was abrupt and very 
marked. On January 22, the stool was diarrhoeal, but con- 
tained no albuminous matter. No balantidia were found in 
either the fresh or the stained preparations. A few badly plas- 
molyzed balantidia and some that were dead were found in the 
stool the next day, however; but with them were several hook- 
worm eggs in a late stage of segmentation, indicating that 
the condition of the balantidia was due to the age of the stool 
rather than the action of the drug. 
The general soft and feculent character of the yellow stools 
was maintained until February 1, when the fseces became hard 
and constipated and so remained until the patient died. The 
balantidia appeared in the fseces for the last time on January 
29, when four sluggish, badly deformed individuals were counted 
in the examination of twelve fresh preparations, by the aid of 
