Professor Cobbold on the Tapeworm. 275 



segments towards the tail end, each of these joints 

 when perfectly matured and ripe contain at least 

 30,000 eggs, therefore you can easily reckon up 

 how many there would be in 12,000 joints, sup- 

 posing all were mature. I took a number of 

 these joints and put them into milk to make them 

 easy of administration, and with the assistance of 

 Professor Simons and other friends, fed a calf with 

 them. Well, they went down, and the calf was 

 none the worse apparently ; however, after a time 

 it was evident that something had gone wrong, 

 and what had taken place was this, some thousands 

 of eggs had been swallowed, and of these eggs all 

 that were perfectly ripe contained in their interior 

 each a little creature called the six-hooded embryo. 

 This small embryo has a round body provided 

 with two needles in front, and a pair of hooks on 

 each side; with the two little needles it bores, 

 and with a pair of hooks it tears the flesh of the 

 host. After the calf had swallowed the eggs, the 

 shell of each ^^^ was dissolved by the gastric juice 

 of the fourth stomach, all the little embryos thus 

 making their escape ; this, you see, was kindness 

 to the embryo, if it was unfair to the calf. The 

 thirty thousand of little creatures, rejoicing in 

 being free, soon made their way through the flesh 

 of the host. The little calf did not succumb to 

 these wounds, as the human bearer often does 

 to the trichinae; by our assistance it recovered. 

 Well, we calculated how long it would be before 

 these little embryos would arrive at the higher 

 level stage of development, and we had indications 

 aflbrded us that it would be three months, so at 



