of sucb trail 6 tn n tat ions had allowed error to march in upon 



them.* 



at source of error here has been already alluded 

 to in thin discourse. Tin- obsei vers worked in 

 phere charged witli the genus of different organi.-ms; the 

 mere accident of first POBDCHMOU rend, -i -in- now one 

 organism, now another, triumphant. In different stages, 



>?er, of its fermentative or put ivfaeiive eha 

 the same infusion may HO alter as to be Miecessively ; 

 possession of by different Such eases have 



been adduced to show tli u li.-r organisms must 



have been transformed into the later one-, whereas they 

 are simply oases in which different germs, hecause of 

 changes in the infiuion, render themselves valid at different 

 times. 



By teaching us how to cultivate each ferment in its 

 purity in other words, by teaching us how to rear the 

 individual organism apart from all others Pasteur has 

 enabled us to avoid all these errors. And where this isola- 

 tion of a particular organism has been duly effected it 

 grows and multiplies indefinitely, but no change of it into 

 another organism is ever observed. In Pasteur s researches 

 the Bacterium remained a Bacterium, the Vibrio a Vibrio, 

 the I'eni. illium a Pe/iicillium, and the Torula a Torula. 

 Sow any of these in a state of purity in an appropriate 

 liquid; you get it, and it alone, in the subsequent crop. 

 In like manner, sow small-pox in the human body, your 

 crop is small-pox. Sow there scarlatina, and your crop is 

 scarlatina. Sow typhoid virus, your crop is typhoid - 

 cholera, your crop is cholera. The disease bears as con- 

 stant a relation to its contagiuin as the microscopic organ- 

 isms just enumerated do to their germs, or indeed as a 

 thistle does to its seed. No wonder then, with analogies 

 so obvious and so striking, that the conviction is spreading 

 and growing daily in strength, that reproductive parasitic 

 lemic disease that living ferments 



finding lodgment in the body increase there and multiply, 

 uining the tissue on which they subsist, or de- 



* Tin .-I- win! wi-li f.r an illustration .| vnrv in 



research -, nl r tin- <HreleBoei with \\hi.-i, t 

 caotti >n ' n ' n IIII-TI il. -i ill 'I n II t - ii -I'T [ II halliu- 



ger's rogeneelB t.>l>-r nm 



the Popular Stienw 



