657 
is seen in glass after a short exposure to muscon; while of objects 
such as rubber gastubes it is known that they can hardly ever be 
freed from gassy smell or from vinegary smell after the trans- 
mission of acetic-acid gas. With adsorptions of the second sort the 
phenomenon also appears especially when we endeavour to retain 
odours in a space with paraffin-covered walls. | 
Odorivectors are also strongly adsorbed by paper, even when it 
has been made non-conductive by being heated for some minutes, 
which deprives it for some time of its condensation layer. Many 
remarkable instances occur in which one adsorption cancels another. 
Eugenol, resp. xylidin e.g. drive out allylaleohol, but the reverse 
does not take place. Here also surface-activity must be paramount. 
The application of electrical changes on the objects does not modify 
the adsorption relations of the 1st and 2rd sort, so far as I could 
ascertain. For the adsorption of the 3'¢ sort, however, they are 
conclusive. The latter do not exert an influence on the adsorption of 
smells, which, indeed, need not surprise us, since thus far odorous 
molecules in gaseous state have proved to be uncharged *). 
1) Hdb. d. Physiol. Methodik, Bd IIIf 1, p. 50, 1910, A. HEyNiNnx, Essai d’Olfac- 
tique physiol., Bruxelles 1919, p. 221. 
