798 Experiments 



Subchapter III 

 SUMMARY 



The experiments included in the present chapter prove in sum- 

 mary that at pressures above or below one atmosphere, the germi- 

 nation and the vegetation of green plants are delayed, even ar- 

 rested. Just as for animals, this fatal effect is due not to the pres- 

 sure itself, but to the oxygen tension, either too weak, whence there 

 results a kind of asphyxia, or too strong, killing the seeds or the 

 plants. 



In the third part of this book, we shall draw from these data 

 the conclusions which they permit in regard to the geographical 

 distribution of plants and the appearance of plant life on the sur- 

 face of the earth. 



1 P. Bert. Sur les mouvements de la sensitive, Second memoir. Societe des sciences 

 physiques et naturelles de Bordeaux, Vol. VIII, p. 1-58, 1870. 



2 Dobereiner, Experiences sur la germination dans fair condense ou rarefie. Biblioth. univ. 

 de Geneve, Vol. XXII, p. 121, 1823. 



