Ilymenolejyls^ was found to be infected after a month, during which 
, time he was accustomed to collect the feces of an infected patient for 
use in (trassi’s experiments. As Grass! stated, however, these tw.o 
cases are not conclusive, since the experiments were made in a country 
|| where the parasite is common, and since, also, the worms might have 
been present in the intestine without eggs being manifest in the 
feces. As further evidence of the occurrence of a development in 
man similar to that which occurs in the rat. Grass! (Grass! & Rovelli. 
1892a) mentions cases occurring during th(‘ years 1890 anxl 1891 in 
; children of well-to-do families. Some of the children belonging to 
; these families would ])ecom(‘ infected, and. 2 to d months later, their 
66 67 
Fig. 66.— Longitudinal ,‘;eotion of an embryo of H. nana at about the same stage as the preceding 
figure; rostellum protracted: />/. p.. anterior opening of secondary cavity; caucL, caudal appendage; 
pr. car., primary cavity; sec. cur., secondary cavity. Enlarged, (.\fter Grassi & Rovelli, 1892a. pi. :5, 
fig. 24.) 
Fig. 67. — Longitudinal section of an intestinal villus of the rat, eontainiug a cereoeystis of ][. unvu. 
Enlarged, (.\fter Grassi Rovelli. is92a. pi. :3, 6g 2.5.) 
brothers and sisters would also show infection. In such cases it seemed 
to Grassi that the chances are very much against the possible swal- 
lowing of invertebrates which might contain cysticercoids, and that 
the circumstances are arguments in favor of the occurrence of direct 
infection, through the feces, from one child to another. Somewhat 
similar evidence is given l)v Venuti (1895), who, according to Massari 
(1898), was able to explain the phenomena associated with the appear- 
ance of JlymenoIep!f^ among the inmates of a boys' asylum at Catania 
ontyupon the assumption that direct infection occurred. (See p. 55.) 
In the absence of conclusive positive experimental evidence, one 
may not, of course, make the absolute statement that Hynumolepi^ itartu 
