16 G 
POPULAR SCIENCE REVIEW. 
sequel I think this will be shown to be the probable source of 
the entozoa in question ; and, as regards the Oxifurls vermi- 
cularis we are still entirely in the dark respecting its deve- 
lopment and migrations. Some go so far as to state that the 
Oxyuris requires no intermediate bearer ; but this is a view 
which I believe to be contra-indicated by all that we know 
respecting the development and migrations of its nearest allies. 
Celery, Cabbages, &c. — Under this head we may include 
all the ordinary market-garden vegetables commonly in use ; 
for the remarks which apply to one kind of garden vegetable 
necessarily, as far as entozoa are concerned, apply to every 
other kind derived from the same source. . Decomposing 
anynal and vegetable matters appear to be eminently favour- 
able to the development of the embryos of certain nematode 
worms ; and hence it happens, that the more filthy the w'ater, 
sewage, or liquid manure employed to increase the fertility of 
garden crops, the more likely are the latter to supply us with 
the larval forms destined, in the absence of the requisite pre- 
cautions on our part, to gain access to our 
stomachs. Thus, in the instance of a mere 
infant of 13 months old, whose case I have 
already placed on record, and who suffered from 
the round-worm (Ascaris mystax, fig. G), which 
commonly infests the cat, I was informed by Mr. 
Scattergood, the medical attendant, that for two 
or three months previous to the child^s illness, 
the nurse had frequently given it a piece of 
celery to chew. The evidence, moreover, that 
the entozoa had been derived from this source 
was tolerably conclusive, not merely from the 
negative circumstance that the child had never 
partaken of raw meat and uncooked hams, but 
also from the fact that it seldom drank any 
water ; and even in those few instances in which 
natural it had donc so, the water had always been 
carefully filtered, and was the same as that com- 
monly drunk by the family. As Mr. Scattergood observed, 
the market gardens about large towns are often watered from 
ponds containing all sorts of abominations, and consequently 
one cannot too strongly recommend the thorough washing of 
all vegetables supplied from this source. In connection with 
this subject, it is not a little instructive to remark that in the 
celebrated case of Mary Riordan (where 1,206 coleopterous 
larvae of Blayjs mortisaga, some perfect insects, several speci- 
mens of Ascaris mystax, and one example of A. lumhricoides 
were entertained by the host^'’), the patient had, from super- 
stitious motives, long practised the repulsive habit of drinking 
water mixed with clay taken from the grave of a priest. If, 
Eig. 6 . — Ascaris 
