BRIEF HISTORY OF BACTERIOLOGY. 



used in 1906-07 by these and other scientists 



working independently have brought to light 



the true relationship which this germ (hitherto 



considered doubtful), bears to the loathsome 



disease, syphilis, the micro-organism of which 



has for so many years remained a mystery to 



the medical profession and to other scientific 



workers. Authorities in both Europe and the 



United States are now satisfied as to the 



authenticity of the spirochetae pallidae: 



The germs which cause many of our most 



common communicable diseases still continue 



to be undiscovered. We are in the dark as to S!m?5L^""s 



Still Baffle 



what parasite is responsible for small-pox, Scientists. 

 scarlet fever, measles, chicken-pox, etc. Rheu- 

 matism and arthritis deformans are believed by 

 some authorities to be germ diseases, but as yet 

 this theory has not been proven, although an 

 antistreptoccic serum is in use in some parts of 

 the United States which is said to be helpful in 

 both of these incurable diseases. 



SUMMARY OF CHAPTER I. 



The earliest days of bacteriology said to be 

 traceable to the time of Caesar, in whose day a 

 Roman writer hinted at the invasion of the 

 human structure by "creatures" invisible to the 



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