16,1 Haughwout and Horrilleno: Intestinal Parasites 39 
make-up of the child was good. The other cases in which Giar- 
dia were found were so parasitized with other organisms as to 
render it futile to speculate upon them. 
We are inclined to regard this organism as potentially tiarm- 
•ful, particularly in children. Much has been written con- 
cerning it; but we lay considerable stress on the views of 
Fantham and Porter, (18) who have studied it experimentally 
in animals as well as clinically in man. They conclude that 
the organism is pathogenic to man and is capable of producing 
diarrhoea that may be persistent or recurrent. They also state 
their belief that the virulence of the parasite varies. 
Mantovani(38) takes a rather extreme view of the case, how- 
ever, in reporting symptoms which even included ulceration of 
the rectum. His patients exhibited tenesmus and passed as 
many as thirty or forty stools a day. We have seen nothing 
of the kind in our experience, and we are inclined to attribute 
the tenesmus and ulceration about the rectum to something else, 
especially in view of the fact that Giardia is normally an inhab- 
itant of the small intestine. The unencysted forms are seldom 
encountered so far down in the intestine as the rectum. We 
have seldom found unencysted forms in the faeces. 
Eutrichomastrix sp. (?) — A single individual was found in 
the examination of fresh preparations in one of our cases. We 
failed to find others on repeated examination of the stool or 
the stained preparations. 
This parasite was not discovered until the second stool was 
received in the laboratory. At first it was thought that the 
organism belonged to the trichomonad group, and it was care- 
fully followed for upwards of half an hour to discover if it would 
ingest any of the erythrocytes that were present in large num- 
bers in the stool. It did not. Gradually it became apparent 
that what at first had been regarded as an undulating mem- 
brane with its marginal flagellum was, in reality, a free fla- 
gellum of prodigious length directed downward and backward in 
heteromastigote style. Careful scrutiny showed that the organ- 
ism possessed three anteriorly directed flagella and a posterior 
projection that we interpreted as an axostyle. We were unable 
to determine with certainty whether or not there was a cytostome. 
We regard it as possible that this organism was identical 
with the flagellate described by Chatterjee(7) under the name 
Trichomastix hominis. However, there is room for some doubt 
here, and we wish to be understood as only provisionally placing 
