i 



• ■ * 



XXVIU 



TUB BEGINNINGS OF LIFE, 



answer to this, I can only call attention to the fact that 

 changes of this kind must have taken place * spontaneously ' 

 in the fluids within the experimental tubes which, after havino- 

 been submitted to temperatures varying from i33°-i53°C. 

 for variable periods, were nevertheless subsequently found to 

 contain living organisms. We are compelled to come to this 

 conclusion, not only because there is not one tittle of evidence 

 at present existing to show that any living thing could live 

 through such an exposure, but because there are very strono- 

 reasons indeed which should suffice to convince us, that no 

 living thing could be subjected to such a temperature without 

 its life being certainly destroyed. Therefore, in these cases, 

 the particular molecular re-arrangements must have been 

 initiated without the intervention of living ferments, and they 

 are thus comparable with those that are known to take place 

 in a solution of cyanate of ammonia. Here 'spontaneously,' 

 or with the aid of a httle heat only, a molecular re-arrange- 

 ment occurs, and the saline cyanate of ammonia is replaced 

 by a totally diff*erent, though isomeric compound, urea. In 

 order to eff'ect this transformation, no Hving agency is neces- 

 sary — none has even been supposed to exist; and there is no 

 more really cogent reason why we should imagine such an 

 agency to be necessary, in order that tartrate of ammonia 

 may undergo a more or less similar isomeric transformation, 

 {d). We find^ moreover, different kinds of living things 

 associated with different sets of conditions. In none of the 

 crystals of tartrate of ammonia have I ever found a single 

 distinct Bacterium^ and there has been the same complete 



F 



absence of organisms of this kind in all my experimental 

 fluids containing ammonic tartrate and sodic phosphate, 



This agreement is 



which have been sealed in airless flasks. 



very striking, seeing that whenever a similar fluid, or a solu- 



n ■ 



tion of tartrate of ammonia alone, is exposed to the air, 

 Bacteria appear in abundance. There is a marked accord- 





1 i! 



therefor 



.nibenveen 



the I 



ofammoniJ 



5 -ffflto living mc 



^h' 



i'ie evidence \nth 

 ' jiaojements of 



taking ] 



< 



i\ 



lifre-esisting livii 

 'd in the crystal 



4 



' ;:: in the exp 



, I deem i 



alf ore-like bod; 

 ■*,liave been 

 M living matte 

 ' ?'»■ If it hac 

 W", there v 



It tad 



occurrc 



"4 



»e stiU 



unco 



e, 



i 



not be 



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I 



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