PAEASITES. 91 



which lodged twenty-four Filariae lobatie in its lungs, 

 sixteen Syngami tracheales in the tracheal artery, besides 

 more than a hundred Spiropterse alatee within the mem- 

 branes of the stomach, several hundreds of the Holosto- 

 mum excavatum in the smaller intestine, a hundred of 

 the Distoma ferox in the large intestine, twenty-two of 

 the Distoma Mans in the oesophagus, and a Distoma 

 echinatum in the small intestine. In spite of this affluence 

 of lodgers the bird did not appear to be in the least 

 inconvenienced. 



Krause, of Belgrade, mentions a horse two years 

 old, which contained more than five hundred Ascarides 

 megalocephalm, one hundred and ninety Oxyures curvulse, 

 two hundred and fourteen Strongyli armati, several mil- 

 lions of Strongyli tetracanthi, sixty-nine Tsenise per- 

 foliatm, two hundred and eighty-seven Filariee papillosse, 

 and six Cysticerci. When we consider how many eggs a 

 single worm produces, we can understand how it is that 

 so few animals escape being invaded by them. 



Sixty millions of eggs have been counted in a single 

 nematode, and in a single tape-worm, or rather in a 

 colony, even a thousand millions of eggs. Even the, 

 very animals which live as parasites, harbour others in 

 their turn. We find parasites on parasites, as we find 

 messmates upon messmates. Almost all writers on this 

 subject give examples of these; some in the larvae of 

 ichneumons, others in the lernaeans, and we have more 

 than once met with nematodes in different Crustacea still 

 attached to their host. 



In order to understand thoroughly the living furni- 

 ture of an animal, especially of a fish, it is necessary to 

 examine it while young ; the feces are the Kitchen-mid- 



