44 THE INTERNAL PARASITES OF 



of bladder worms in a pound of beef would afford a 

 total of many thousands of measles in an ordinary full- 

 grown ox. That such an amount of infection may 

 actually occur in nature appears evident from the circum- 

 stance that the small slice of meat here figured was obtained 

 at Calcutta, where cyst-affected meat is admitted to be rare. 

 In proof of this comparative immunity, at Calcutta, 

 I may adduce Dr. Lewis's testimony, which is par- 

 ticularly interesting as well as instructive. Speak- 

 ing of the measles, he says : u After trying in vain 

 for months to obtain a sample, I felt greatly surprised 



Fig. 11. Slice of Roasted Measly Beef. 



at having after all to make their acquaintance, for the 

 first time here, in a cold sirloin placed before me at 

 breakfast, and off which I had dined on the previous 

 evening without the slightest suspicion. The beef, it 

 seems, had been obtained at the Dhurumtollah bazaar 

 in the usual way." The accompanying illustration 

 (Fig. 11) represents a portion of Dr. Lewis's cold sir- 

 loin, in which, to use his own words, the bladder-worm 



