96 PLANT RESPIRATION 



The author of this book agrees fully with this latter view. 

 Moreover, it must not be forgotten that the recovery of plants 

 after the anaerobiosis does not constitute an objection to the 

 assumption of a toxic effect under such circumstances. 

 Whether the plant recovers or finally dies depends only on the 

 degree of the poisoning. Boysen-Jensen's demonstrations in 

 behalf of a possibility of the direct combustion of sugar in the 

 respiratory process will be further treated below. It appears 

 that this kind of direct combustion is hardly possible in the 

 plant cell. 



Let it be noted that the treatise of Boysen- Jensen contains 

 important and interesting experimental results which have 

 already been considered in part but some of which are men- 

 tioned on subsequent pages. The theoretical differences of 

 opinion are really of secondary importance. The author of 

 these lines sees, for example, in the various facts communicated 

 by Boysen- Jensen, a confirmation of the theory of the connec- 

 tion of anaerobic with normal respiration. As there is no 

 direct, unambiguous proof of the validity of this theory such 

 adverse views are probably unavoidable. 



