ThIi: MiciioscoplE. 11 



\he action of the microl)es in tlie animal. It is a new field open 

 to experiment and observation.^' These were exactly,- word fot 

 word, the conclusions of Dr Koch in the month of August last>, 

 tmd it is on a false interpretation, or rather on a premature con^ 

 ■elusion, that the idea was created at that time that his researches 

 had attained to the cure of consumption in the case of man. Dt 

 Koch* had not even made allusions to this. It was only later, 

 and following always the idea and the scientific methods which 

 have always guided Dr Koch, that he began to experiment upon 

 man, guided by the definite results already obtained upon ani^ 

 mals and with a feeling of certainty that like results would 

 follow. 



With a simple Pravaz syringe and drops of the liquid, the 

 iconsumption disappears and the hectic flush is modified ; the 

 patient is cured ; and if Dr Koch is not yet willing to divulge 

 his secret it is because he is wise in his own opinion, founded on 

 scientific principles-, and that he is not willing to leave one iota' 







Pig. 4. — A piire culture of the bacilli of tuberculosis examined 

 under the microscope. 



of error. He was able to kill and to examine his guinea pigs when 

 he wished to know the degree of advance in their cure; but he can' 



