^^. 



THE BEGINNINGS OF LIFE. 



°"s varied t;; 



"^^i^ has SI 

 chet has 



"I 



^e obtaindt 

 when Uf: 



i i 



organic mat 



27):-'Boryiex 



ure d'apres 1« i 

 ueur5 fermentestii: 



fy 



nises qui 



i ^ 



?s a 



liments f \ 

 Is re-P'^^' ^ 



• . n eut *"' ,. 



bt be ''' 



lithe 





303 



ganisms which reveal themselves ; and, similarly, when 

 solid portions of organic matter are immersed in solu- 

 tions, different results are produced by their immersion 

 at various depths '. Abundant evidence of such facts 

 may also be gathered from what has been stated con- 

 cerning my own experiments. Again, the boiling or not 

 of the organic solution^ as we have seen^ has a very great 

 influence over the kinds of organisins^ as well as over 

 the rapidity with which they appear^. It has^ more- 

 over^ been ascertained that differences in the amount 



in portffi of heat and electricity, and in the kind and degree of 



light, which are allowed to operate upon the various 



iuence nolo: fluids, are all more or less influential, and exercise a most 

 the kind 0!': undoubted influence over the kinds of organisms that are 



to be met with in different cases. So that the amount 

 and kind of modification which is capable of being^ 

 brought about in the living forms that are to appear 

 in different infusions made with the same water and 

 ,; Again,lie?'' exposed to the influence of the same air, are of such 

 .^turonspour^^- ^ nature as strongly to encourage the belief that such 



ictions speciater ^ ' ^ 



leurs...-^-,.. 



living forms cannot to any appreciable extent be derived 

 either from the air or from the water. 



In illustrating this part of the ar^'ument, which has 



reference to the development of organisms in solutions 



^^5 fete "'"^ exposed to the air, we have purposely laid most stress 



upon the mode of origin of the ciliated Infusoria rather 



^ See Poiichet's ' Heterogenie/ pp. 154-159. 

 ■^ See also Pouchet, loc. cit., pp. 148-150. 



