Mccml nm afi»*r a Iniiy turn* In any case, iliey do not appear in 
tbe orinc (or the f.u'ccs) at onav Tltc beginning of the haematuria 
, qaitc itisKhous; fr«>ni ligypl many cases arc known where there 
not «r\cn haematuria ; the eggs were acciilcntally discovered in 
. ijmiiutiiitis uf the urm<‘ made lor otlier purposes. 
While iravelhng throtigh the tissues the eggs undergo their 
finbiyooH: lieN-clopment The eggs at any time visible in the uterus 
-.4 the fnnale worms mvariahly contain an undivided egg-cell. As 
tl- mibfjo clc\eIo|)s wUlini the egg shell, tlie egg itself increases in 
that with a inaturc miracUlium inside measures, on an average, 
-13 to o't 5 by 0'04 to o'oO mm., wlicrcas immediately after formation 
in the oot>-pe it is only 0 08 to o oij by 0-03 to 0-04 mm. in dimension. 
During the emlrryonic ilcvcloinnent, man)’ embryos die. Their 
bodies Ix-comc gradually tlccomposcd, and afterwards replaced by 
<*karcou!s masses; tlic eggs bcctmic ‘ calcified.* llieir appearance 
in this stale is known well cnouglt, so 1 do not want to dwell on it. 
With the moment of the dcatli of the embryo, llic increase m size of 
the whole egg is stopped. The calcified eggs thus present the well- 
knwwn v.inalwms in si/.e; they remain small wlien they died early, 
they are larger wlien tliey died later. 
Appearances 1 have seen in many sections of bilharzial tissues (of 
recent and old cases) make me believe that 
longer capable of traversing the tissues as 
easily a» living ones do. They will thus remain in the 
tnaoes more easily. In cases of very long standing they are o ten 
loond quite alone; in other words, cases in which calcified eggs are 
foood in the tissues, or voided with the excreta, are old cases. 
The age the worms may reach is not yet known; for the sake ot 
■»)■ argument we will assume that it be three years, 1 hree years, 
therefore, after a man has become infected (and has had no occasion 
- to become rc-infecled!) adult worms will no longer be m is 
But during their three years’ life the females have pro uce 
an munense quantity of eggs. Many of them have been voi 
<fanng the same time, but as many, probably many more, are sti in 
the tttsoes, and continue to be voided with the urine (or the aece 
for a more or less longer period. But their presence, and even le 
P»«ence of a live miracklium in them, is by no means a sign a 
*onns which fwoduced the eggs are still alive. I may men 10 
