193 
13/7 1914, Nuphar root. Intercellular air .......…. 13 ho 05: 
== Code ok alf "ASE ARERERE 88 03 
Diff. + 2,6 Yo 0,. 
7 — Intercellular air... 8 0 0. 
mg Cocoon gr. ES sg 0 "le 0... 
3/7 1 Dypha root, 'Intercellular air... …. Ls FAE ST 
RE En Coon air 1. akgkonde 2;40jo: Og. 
Diff. + 5,5 4% 0... 
Jo 1918 Inters llnlår ak 1: 1510 GS: 
- — GE rr T/R NT uh ERE Se RER es GERE: 102 0 0, 
Diff. + 2,9 %o 0... 
Ås the main result of these analyses we must lay stress upon 
the fact that the oxygen percentage always is lower in the cocoon 
than in the intercellular spaces with which it communicates ; 
oxygen will therefore diffuse from the intercellular spaces into the 
Cocoon, but we cannot yet decide whether this is the only way in 
which the air in the cocoon can be renewed; the oxygen in the 
water might be of some importance too"). 
The following experiment shows that the oxygen in the water 
is: without influence upon the renewal of the air in the cocoon. 
An uncompleted cocoon — that is a cocoon in which the 
hole through the wall still not is gnawed — was for 3 hours 
enclosed in water saturated with atmospheric air; after that the 
Composition og the air was determined, and the result was that the 
air only contained a trace of oxygen”). 
1) Babak writes (in Wintersteins Handbuch I”, p. 471): "Allerdings kann 
der Luftinhalt (in the cocoon) auch durch Diffusion aus dem Wasser 
sauerstofhaltig bleiben”. 
2) According to the analysis the O, percentage was 0,07 "Io but this is 
within the limit of errors; moreover we must remember that on 
account of the diffusion the O, grint Ål under such conditions 
must be found a little higher than it really is 
Vidensk. Meddel, fra Dansk naturh. Foren. Bd. 66. 13 
