OXYGEN RESPIRATION 



nically bothersome that they do not well merit consideration 

 for numerous quantitative experiments. On the other hand, 

 the simple calculation by total weight is permissible in cases in 

 which one deals with materials which contain no considerable 

 number of dead cells and exhibit no very great cellulose content. 

 Useful comparative material yields such results in the case of 

 investigation of lower organisms or embryonic organs of 

 seed-plants. The respiratory energy of various plants and 

 plant parts is illustrated by the following table, compiled from 

 the experimental results of several investigators. The quantity 

 of the carbon dioxide liberated or of the oxygen absorbed is 

 computed throughout for i gram dry weight. 



Plant Material Temp. 



Entire young wheat roots' 15-18° 



Older wheat roots* 15-18° 



Entire young rice roots' 14-17° 



Older rice roots' 14-17° 



Roots of Lainium alburn^ 18-19° 



Roots of Mentha aquatica^ 18-19° 



Roots of Callha paliistris^ 18-19° 



Leaves of Plileum pratense^ 20-21° 



Leaves of Lolium italicmn^ 19-20° 



Leaves of Phragmites communis'^ 19-20° 



Leaves of Veronica Beccabnnga 16-17° 



Leaf buds of Syringa vulgaris^ 15° 35 



Leaf buds of Ribes nigrum- 15° 48 



Leaf buds of Tilia euro pea- 66 



Sphagnum cuspidatum (moss)^ 32 



Hypnum cupressiformc (moss)'' 17 



Germ, seeds of Sinapis nigra- 16° 58 



Germ, seeds of Lactuca sativa"^ 16° 82 



Germ, seeds of Papaver somniferum 16° 122 



Azotobacter chroococcnm'^ 709 



Aspergillus niger 4 day cultures on quinic acid^ . . 276 

 Aspergillus niger 3 day cultures on quinic acid^ . . 682 

 Aspergillus niger 2 day cultures on quinic acid* . 1751 

 Aspergillus niger 2 day cultures on quinic acid-^ . . 1800 

 Aspergillus niger 2 day cultures on quinic acid^ . . 1874 

 Bacillus mesentericus vulgalus" 1 164 



1 Freyberg. Landwirtschaftl. Versuchs-Stationen 23 : 463. 1870. 



2 Garreau. Ann. des sci. nat. (Ill) 15:1. 1851. 



3 Jbnsson, B. Compt. rend. 119: 440. 1894. 



* Stoklasa, J. Ber. d. bot. Ges. 24: 22. 1906; Zentralbl. f. Bakt. 

 tionskrankh. (II) 21: J84. 1908. 



5 Kostytschew, S. Jahrb. f. wiss. Bot. 40: 563. 1904. 



5 Vigno!, M. Contribution a I'etude des Bacteriac6es. 1889. 



RESPiRATORy Energy 

 IN 24 Hours 



67 . 9 cc. O2 absorbed 



82 . 8 cc. O2 absorbed 



44 . 4 cc. O2 absorbed 

 55.1 cc. 0-2 absorbed 



62.5 cc. O2 absorbed 

 37 . 2 cc. O2 absorbed 



19. 1 cc. O2 absorbed 



27.2 cc. O2 absorbed 

 24.8 cc. O2 absorbed 

 1 2 . 8 cc. O2 absorbed 

 24.8 cc. O2 absorbed 



cc. CO2 1 

 cc. CO2 1 

 cc. CO2 1 

 9 cc. CO2 1 

 2 cc. CO2 1 

 o cc. CO2 1 

 5 cc. CO2 1 



cc. CO2 1 

 S cc. CO2 1 



1 cc. CO2 1 

 o cc. CO2 1 



cc. CO2 1 

 cc. CO2 1 

 cc. CO2 1 



iberated 

 iberated 

 iberated 

 iberated 

 iberated 

 iberated 

 iberated 

 iberated 

 iberated 

 iberated 

 iberated 

 iberated 

 iberated 

 iberated 



3 cc. O2 absorbed 



Parasitenk. u. Infek- 



