i 



322 



THE BEGINNINGS OF LIFE. 



their mode of origin even more certain than it had 

 been before. In some situations they were something 

 like tadpoles in shape, whilst in others they were 

 cylindrical, or only very slightly attenuated towards 



one extremity 

 is more comt 



M 



— and no one 



)etent to pass an opinion on such a 

 subject— that Hhe appearance of these little plants 

 within closed cells, occupying their natural situa- 

 tion in the very middle of the medullary tissue, 

 negatives all ideas as to the introduction of germs 

 from without.' And he has even seen similar organ- 

 isms produced within fibre-cells of the bark which had 

 already become notably thickened, in Asclefias cornutt 

 and also in Metaplexis chmensts. (See Fig. 71,^, e.) 



But M. Trecul is able to add another proof even more 

 striking than any we have hitlierto mentioned. He has 

 actually seen a crystalline mass undergo modifications, 

 and become itself converted into an Amylohacter. There 

 exists, he says, in the bark of the common Elder, 

 and in that of plants belonging to different famihes, 

 such as Solanacea and Crassulace^^ a number of cells 

 which are filled with little tetrahedrons having slightly 

 unequal sides. These cells may be isolated^ or they 

 may be grouped in contact with one another, and in 



r 



longitudinal series. The cell-walls sometimes become 



r 



partly absorbed, so as to form intercommunicating 

 lacuna, and it is within these that the enclosed 

 tetrahedrons become 



converted into starch-bearing or- 



ganisms 



M. Trecul 



says: 



Since my observations 



kome elongal 



ifljrical outgi 



n occasion 



eft in its plan 



tim organisn 



I \ I 



IS mdee 



fcf and freed 

 observi 



mass 



*lline 



^ and becon 



) one CO 

 I nature. 



'■^henc 

 * '»«s les 



-'Ik 



tTf 



"lini 



1U( 





H 



