?18 



\'ETERJ NARV PATHOLOGY. 



colloid accumimilation. A flock of 128 hsalthy, yparling- sheep 

 shipped from south central Xew ^ilexico to the Kansas City stock 

 A'ards, were all found to have enlarged thyroid giands at the 

 lime of slaughter, which was about 24 hours after their arrival 

 at the stock ^•ards. The th}Toid glands were found on micro- 

 scropic examination to be affected with pathologic colloid accum- 

 ulation. This occurred in April, the sheep, having been sheared 

 just previous to shipment, and the weather having been very 

 inclement during the entire time that they were in transit. Other 

 entire flocks of sheep that have been unduly exposed have been 

 ai'fected in a like manner. 



Fig-, 11,, — I hutogiapli ol a th.\i.)ia aland ali.rt.ii with Colloid Degeneration. 



Endemic goitre in the human is indicative of an infectious^ 

 cause though the individual cases in non-affected areas dispels 

 the infection theory. 



The absence or diminished quantity of iodine in the food, 

 water or air, may be a causative factor in the production of 

 goitre and other colloid accummulations in the thyroid glands. 



Appearance. — Macroscopic. — Colloid most frequently oc- 

 curs in masses, varying in size from mere microscopic points 

 to bodies as large as a lead pencil rubber or even cyst like bod- 



