TEST TUBE AND BODY EXPERIMENT. 



pletely, provided the requisite degree of affinity 

 exists between the two substances used. There 

 is no third substance present with which one or 

 the other of the materials used may combine, 



Within the body conditions are different, and Union of 

 we are taught that one of two combinations AntitJ>JnLd 

 may occur. The toxin may unite with the anti- with Body Cells, 

 toxin injected into the body, or a second com- 

 bination is possible, viz., the toxin may unite 

 with the tissue cells. 



Union with cells, according to the demon- 

 stration of Heymens in his work with tetanus, 

 is often a very rapid and complete one. 



"Heymens found that if all the blood were removed Experiments 

 from an animal a few minutes after the injection of a °^. Heymens 

 single fatal dose of tetanus toxin and the blood of an- '"'** Tetanus. 

 other animal substituted, still it would be found that 

 the animal died of tetanus." 



All the toxin had combined with the cells in 

 that short time. Experiments of other workers 

 tend to demonstrate not only that the toxin may 

 combine with the tissue cells very rapidly, but 

 they also make clear the manner in which anti- 

 toxins bring about a cure. Interesting experi- 

 ments by scientists with regard to the disease., 

 tetanus, have brought to light the knowledge Experiments of 

 that if the antitoxin is injected into the animal Other Scientists, 

 body four minutes later than the toxin, a slight- 

 ly larger than the neutralizing dose is necessary 

 to prevent tetanus symptoms from developing 

 175 



