16,1 Haughwout and Horrilleno: Intestinal Parasites 37 
brings recollection of the statement of Escomel who concluded 
that Entamoeba histolytica will not engorge the red corpuscles 
of a person taking emetine, but will readily engorge those of 
a normal person. He gathered from this that emetine renders 
the erythrocytes unpalatable to Entamoeba histolytica. This is 
scarcely more convincing than the other observations cited. 
Nevertheless, we believe that further work is needed to estab- 
lish or disprove the diagnostic value of ingested corpuscles 
in the entamoebse. For the present we shall continue to lay 
due stress on the presence of ingested corpuscles in the cyto- 
plasm of intestinal amoebse. In connection with the trichomo- 
nads observed in this series we may say that we frequently 
encountered individuals that had engorged bacteria, a thing 
that was not observed by Haughwout and de Leon in their 
pentatrichomonads. 
The trichomonad infections seen in this series gave us no 
evidence of the pathogenicity of the organism, either microscop- 
ically or clinically. The flagellate occurred to the exclusion 
of other parasites only once. This was the case of a boy be- 
tween 6 and 7 years of age (No. 12), who was suffering from 
ileocolitis and tuberculosis. While the symptoms may have 
been wholly referable to the ileocolitis, it was noted that the 
abdominal pain, which was fairly constant, even when the stools 
were not being passed, was of extraordinary severity. The 
first stool that was examined was watery, feculent, and gave 
off a very foul odor. It was full of necrotic cellular debris and 
erythrocytes, and the flagellates were present literally in 
swarms. Notwithstanding the conditions for the ingestion of 
erythrocytes seemed ideal, no trichomonad was seen that con- 
tained a blood corpuscle. Many were seen that contained 
bacteria. This is in striking contrast to the observations of 
Haughwout and de Leon in the case of Pentatrichomonas. 
The ileocolitis in this case ran a very stormy and protracted 
course but eventually terminated in recovery. Were it not for 
the complicating tuberculosis and the poor general condition 
of the patient as ■ a whole, we should be inclined to lay con- 
siderable stress on the superimposed flagellate infection on the 
dysentery, especially in view of the protracted course of the 
disease. 
Giardia intestinalis. — This organism first appeared in the 
stool of a child between the third and fourth years. Only one 
of the eight cases found produced the flagellated trophozoites 
^ Bull. Soc. path. exot. 8 (1915) 573. 
