164 
rectal lesions. Desiring, some years ago, to make a 
drawing of a lateral-spined ovum, and having no faecal material at 
my disposal I took a papilloma of a preserved rectum and examined 
for ova. There were j^lenty of terminal-spined, but not a single 
lateral-spined could be discovered. New preparations made from 
other papillomata of the same rectum, gave no better results. Serial 
sections made of other recta showed similar conditions, in so far as 
sometimes terminal-spined eggs alone were found, sometimes both 
forms mixed. In no case, however, have I so far found, in the rectal 
wall, the lateral-spined eggs quite alone. The point most important 
in the present connection is that these observations leave no doubt 
that the vesical and rectal lesions so similar to each other in external 
appearance also contain one form of egg only. 
After the theory of Dr. SamboN. this form is distinctive of Sek 
(sniatobium. Sch. haematobium is, therefore, capable of producing 
rectal as well as vesical lesions; I see no reason why, under 
peculiar circumstances, it should not be able to produce, 
>n one case, vesical lesions alone, and, in another case, 
rectal lesions alone. The question as to what these 
peculiar circumstances may be is certainly of great interest, 
A fs^et that both forms of lesions may be 
^AMTr, ^ hamatobium. 'Sch. mansoni’ is said by Dr. 
hi, M ^ ^ specific pathogenic action ’; since Sch. hamato- 
exist n identical lesions the alleged specificity does not 
exist or shows, at least, a very remarkable flaw. 
do no^t 7 cLrT 'V ^"’P^^tant point. If lateral-spined on 
the rertni occur in insignificant numbers only, in 
the faeces '"^possible that such ova when they appear in 
lumbeToV" I had rn a 
lat^ratspL " ' found no trace of 
lateral spined papillomata ; where, then, could the 
shapes of eeps in addition to the occurrence of both 
in my theory as individual, figure as arguments 
spined eggs ^ nature and the significance of the lateral- 
looked for an^m^V^^ ^iHiarzia worms are, in post mortems. usually 
tor. and most easily found, is the portal s^tem. I have, since 
