DISEASES OF FARM ANIMALS 167 



eggs of this worm, on being swallowed, are hatched 

 in the stomach, from which they enter into the 

 circulation, finally lodging in the brain and spinal 

 cord. Those that lodge elsewhere, as in the heart 

 and lungs, grow for a time and then disappear. 

 The most conspicuous symptom is the staggering, 

 stupefied condition of the afifected animal. 



In walking, if a single side is afifected, a circle is 

 described. The feet are raised as if the animal did 

 not see well. In many cases blindness results. 

 The growth of the worm Is somewhat rapid. In 

 about three weeks after the appearance of the 

 disease a softened condition of the skull results, 

 which may be found by pressing the fingers over 

 it. From this it will be observed that there is prac- 

 tically no treatment for animals affected. Occa- 

 sionally the skin is accidentally broken over the 

 point where the worm is encysted, out of which it 

 emerges and the sheep recovers. 



Treatment, therefore, is along the line of this 

 natural recovery. Find the soft spot by pressing 

 the fingers over the skull, then Introduce the trocar 

 and canula. Withdraw the trocar, apply a syringe 

 to the canula, and withdraw the contents of 

 the cyst within. Of course, inflammation of the 

 brain may set In and the sheep die from this, or 

 another worm may be present and grow, thus caus- 

 ing continued disease. Inasmuch as the bladder 

 worm of sheep is a stage of the tape-worm of the 

 dog, it follows that destroying all affected sheep, 

 so as to prevent the dogs from becoming reinfested 

 from It, is the only really safe and satisfactory 

 method of warding off the trouble. 



GLANDERS. — A contagious disease peculiar to 

 the horse, ass, and mule, and may be communicated 

 to human beings, and also sometimes to carnivorous 



