i6g 
however, possible that the females are capable also of undertaking 
the wandering alone. As a matter of fact, isolated females have 
been seen lu various veins; but it is not sure whether they got there 
alone or by the help of males whom they afterwards abandoned. 
During this journey all females go on laying eggs—at first 
abnormal ones, later (i.e., after they have become impregnated), 
normal ones. In all wider vessels, these eggs also are taken up 
by the blood stream and carried back to the liver where they join 
those which have arrived previously. There is, however, the probability 
that, now, terminal-spined ones may be among them; observation 
tells us that indeed these occur in the liver, though m numbers 
which vary considerably in the individual cases. But from what 
has been said above we may derive as the general rule that 
the lateral- spined eggs will prevail, the longer the females 
had to wait for fertilization, whereas the te r m in a 1 - spined 
eggs will prevail, the sooner the females became fertilized. 
In the walls of bladder and rectum the worms make their way 
into the hner ramifications the diameter of which gradually becomes 
equal or even less than that of the male. From this point onwards 
it is difficult for the eggs laid by the female to escape into the genera 
circulation. Pictures I have seen in sections of the vesical 
and rectal wall even seem to indicate that the females can stretch 
their (already thin) bodies to such an extent, escaping at the same 
time more or less from the gynaecophoric canal of the ^ ^ 
their heads (close to which the genital aperture is situated) reach 
very fine capillaries. Eggs deposited there- either singly or in 
groups-would be kept in place by the walls of the vessels closing in 
Upon them as soon as the female withdraws to her origina p a 
The process may be repeated more or less often, a whole area 
becoming thus stuffed with ova. I have not seen 
here described actually going on; it is also pro a e 
many variations occur ; but the chief details are based on o 
The eggs, though originally deposited in the blood vessels, finally 
appear in tL urine or the faeces = they must have passed ^hr^gh the 
tissues of the organs. I do not consider it as illogical to admit that 
what happens to the eggs in the walls of bladder and rectum 
also happen to the eggs in the live r. Observation actually shows 
