228 The Management and Treatment of the Hon 



•8C, 



mode of development of the beef tapeworm. I will 

 explain to you one kind of experiment I made. I took 

 a portion of a tapeworm comprising several of the joints 

 or segments towards the tail end, each of these joints 

 when perfectly matured and ripe contain at least 80,000 

 eggs, therefore you can easily reckon up how many 

 there would be in 12,000 joints, supposing 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 egg was dissolved by the gastric juice of the fourth 

 stomach, all the little embryo 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 

 trichime ; by our assistance it recovered. Well, we 

 calculated how lung it would be before these little em- 

 bryos would arrive at the higher level stage of develop- 



