W. P. Wilson—Respiration of Plants. 427 
Lupinus luteus. 
; : { Ist half hour, lat Bat soe te 9 
I. Period. Air. 1 d half hour, 66 at 
: 3d half hour 5 . 
II. Period. Hydrogen. 4th half hour, +h oe és 
: : { 5th half hou So re 
III. Period, Air. { 6th half hour, ey el me 
The rig tot ab decrease in the amount of expired carbonic 
acid in hydrogen is here greater than with many plants. ‘The 
Dears face shows much less difference: 
Cantharellus cibarius. 
I. Period. Air, 1 hour 1000 98" U0. 
Il. Period. Hydrogen. 1 i poate 1080: + * 
Mil. Period. Air. 1 hour =16'20. me 
It will be seen that with Lupinus luteus less carbonic acid was 
measured in the fifth than in the sixth balf hour. This is 
coabpencll based upon the fact that at the begiuning of the fifth 
half hour the seed-vessels contained less carbonic acid than at 
the Rasalig of the sixth. With a constant current of air and 
a constant production of carbonic acid, it requires a little time 
efter the airor gas has been changed before an equilibrium 
between = produced me the out-flowing gas establishes itself. 
mong a large variety of germinating “plants, branches with 
leaves, a ‘fruits and fungi, Viera Faba te as been the only 
plant which has given results differing from t : 
That the volume of carbonic nis expired in "norm and in 
intramolecular respiration is the same, is, therefore, in accor- 
‘dance with the facts above nistea, untrue. The theory which 
Wortmann founded upon this fallacy, viz: that the total 
volume of carbonic acid excreted in cece elepees has its 
the 
origin absolutely independent of xygen “ air, in 
intramolecular ee eke saa to the gro 
Moreover, if it had been found by sletaritian, that the 
volume of carbonic acid given ane in intramolecular equaled 
that of normal respiration, Wortmann’s theory would still fail. 
This has been well shown by W. Pfeffer, in saying, substan- 
tially : if an equal pres of carbonic acid were formed in 
free oxygen was absent, the full supply might yet be obtained 
through constant powerful attractive forees which could take. 
