16, 1 Haughwout and Horrilleno: Intestinal Parasites 33 
eurygyrata may be a factor in a certain type of rebellious 
entamoebic dysentery which, while especially resistant to ipe- 
cacuanha and its derivatives, frequently yields to treatment 
with salvarsan. 
“Blastocystis.” — We include this organism in our report with 
some hesitation because of the lack of definite knowledge con- 
cerning its nature and significance. In as much, however, as 
neither has been determined, we thought it wise to make a 
record of our findings as a basis of comparison in future work. 
We encountered “Blastocystis” in thirty-four cases, but it oc- 
curred as an exclusive parasite in only one case. Stained 
preparations of these bodies were studied in every case to dif- 
ferentiate them from the “Iodine Cysts” of Wenyon and others, 
now regarded by Kofoid, Komhauser, and Swezy(35) as the 
cysts of a large race of Endamoeba nana {Endolimax nana), 
and the aberrant forms sometimes assumed by some of the 
other intestinal amoebse of man. In view of the findings of 
Kofoid, Komhauser, and Swezy in their excellent study of the 
“Iodine Cysts,” we perhaps should have carried over our two 
cases of “I Cyst” infection to the Endolimax nana column. 
However, we satisfied ourselves beyond a reasonable doubt that 
none of the bodies we have classified under “Blastocystis” rep- 
resent encysted stages or aberrant forms of any of the intes- 
tinal amoebae, and there we leave them. 
Entamoeba histolytica. — No case of infection with this par- 
asite was discovered in our series, and this we are inclined 
to regard as possibly of great significance. Another interest- 
ing thing was our failure to observe Charcot-Leyden crystals 
in more than one case. We observed them once only, in the 
faeces of a 12 year old girl whose stool was positive for “Blas- 
tocystis,” Spirochasta eurygyrata, Trichuris, and hookworm. 
In view of the recent work of Acton (i) on Charcot-Leyden 
crystals in the faeces, we made a particularly thorough study of 
this case without, however, discovering either the cysts or 
trophozoites of EntamcBba histolytica. Acton has shown that 
there is a very high degree of association between these crystals 
and Entamoeba histolytica, and he lays considerable stress on 
them in connection with the laboratory diagnosis of entamm- 
biasis; for they are, according to his figures, rarely found in 
other infections. Castellani has reported them as occurring 
in ancylostomiasis, and it should be noted that our case was 
infected with hookworm. The crystals found in this case were 
of the shorter type that Acton designates as characteristic of 
169496 ! 
