100 The Farmer's Veterinary Adviser. 



half inches long, and 8. Rufesceiis of considerably greater 

 length. The calf, horse, ass and mule have the Strongylus 

 Micrurus of from one and one-half to three inches long. 

 The pig, the Strongylus Elongatus of eight lines to one 

 and one-half inches long. Finally the bird (lien, turkey, 

 pheasant, black stork, magpie, hooded crow, green wood- 

 Fig. 15. 



Fig. 15 — Strongylus Filaria, male, enlarged, Thudicum. When adult, 

 should be at least five times the length for this thickness. 



pecker, starling, siuift, etc.,) have the Syngamus Trachealis, 

 male one-eighth inch, and female one-half to five-eighths 

 inch in length, always found united together, so that the 

 male appears Hke a process from the neck of the female. 



The Strongyli in their mature condition inhabit the air 

 passages within the lungs but they may be reproduced 

 either in or out of the body. In the first mode the female- 

 worm creeps into an air cell and there encysts her- 

 seK and produces eggs or yoimg worms already hatched, 

 or she dies and the myriad eggs, hatching out amid the 

 debris, the young worms finally migrate into the adja- 

 cent air passages, grow to maturity and reproduce their 

 kind. In the second mode the impregnated female worm 

 is expelled by coughing, and perishes in water or in 

 moist earth or on vegetables, and the eggs, escaping from 

 her decomposing remains, may lie unhatched for months 

 or even a year, or, in genial weather, may rapidly open 

 and allow the, escape of the almost microscopic embryo 

 worms. These, in their turn, may live an indefinite 

 length of time in the water, or moist soil, or on vegetables, 

 and only begin to grow to their mature condition when 

 taken in by a suitable host with food or water. This is 

 true of those of the sheep, goat and camel, of that of the 

 ox, horse and ass, and of that of the pig. Only those of 



