59 



iuteriuediate host, as a worm, before it can develop 

 into a mature parasite in the body of the fowl. The 

 symptoms occasiored by these jjarasites are similar to 

 those produced by tapeworms but are of a less violent 

 and serious character. 



The remedies and means of prevention are prac- 

 tically the same. 



3. ROUND WORMS— NEMATODES. 



The round worms are elongated and usually quite 

 slender parasites, mostly of a whitisli color and are 

 provided with a mouth and digestive canal. When 

 present at all they are apt to exist in considerable num- 

 bers, and sometimes occur in vast quantities. There 

 is one form of round worms known as Trichosoma con- 

 tortum, a little white worm from one-half to three- 

 fourths of an inch long, that has been found beneath 

 the mucous membrane lining the oesophagus and crop. 

 Sometimes as many as thirty of these worms have been 

 found in the oesophagus in a single bird. They inter- 

 fere seriously with the passage of food through this 

 tube, affect the digestion and apjjetite and cause wast- 

 ing and \\eakness. At length, the oesophagus be- 

 comes engorged with food, it cannot contract or pass 

 its contents along and the animal dies within a few 

 days. 



Some species of round worms collect in the intestine 

 in great nun'bers, in fact, as many as five hundred have 

 been removed from the body of a single fowl. By their 

 presence they occasion a good deal of irritation of the 

 digestive tract, intref ere with nutrition, cause diarrhoea 

 and weaki.ess and death. Sometimes the disease 

 caused by these parasites follows a long course anjl 



