PATHOLOGY. 



science of disease (sometimes called Nosol- 

 ogy as well as Pathology). The cell becomes 

 infected in hundreds of ways; indeed the 

 primary basic infection of the organism must 

 lie in it as the ultimate organic unit. The 

 bite of a certain kind of mosquito introduces 

 into the cellular tissue of the body a hostile 

 cell or microbe which produces the scourge 

 known as yellow fever. The ordinary organic 

 cells are totally unable to resist the incursions 

 of this terrible foe, who rapidly sweeps to the 

 center of life. Unless he be met by a new 

 power introduced from the outside, he will 

 soon have possession. But first he must be 

 distinctly separated and recognized before he 

 can be successfully attacked; or the bacillus 

 must be found, as the books say. In like man- 

 ner there is a cholera bacillus, a consumption 

 bacillus, etc. It has always been regarded 

 as a great scientific event when .the investi- 

 gator has fully isolated and described one 

 of these microscopic enemies of life. Still 

 greater has been the jubilation when the scien- 

 tist has found some counter agent (serum, 

 anti-toxin, anti-septic, etc.), which will single 

 out the intruder and slay him without per- 

 manent injury to the other cells of the organ- 

 ism. The most famous name in this field is 

 doubtless that of Louis Pasteur, who has 

 found the antidote for the bite of the mad 



