1446 
of the inspiration tube is passed into the forward half of the nostril, 
while the back part and the other nostril are left open. So the 
Into this chamber, mounted on high 
legs, the observers head is thrust 
through an opening below, which can 
further be closed by a sliding lid. Under 
this lid an olfactometer is applied. 
Through the camera runs a movable 
glass tube for a current of air to pass 
through. This current serves to clean 
the inside tube of the olfactometer in 
the intervals of the experiments. To the 
left is a rotating fan. (When the space 
is used as a camera inodorata a 
uviol-mercury lamp is burning to destroy 
the adsorbed odours through ultra- 
violet light.) 
Smelling Chamber of a capacity of 
400 liters arranged for exhaustion- 
experiments. 
observer inspires the air from the olfactometer with the one nostril, 
and with the contralateral nostril he inhales the perfumed air of 
the camera. In order to perfume the air that passes through the 
olfactometer in the same degree as the air in the large camera a 
flexible tube is led from the camera to the olfactometer. This tube 
is taken up by an obturator applied to the outer cylinder of the 
olfactometer. 
As the flexible tube consists of metallic rings held together by 
caoutchoue, it is necessary first to wash the tube out with tapwater 
without drying it in order to deodorize the caoutchouc. 
These precautions enable us to make the measurements at the 
olfactometer while being assured that they take place in the perfumed 
air for which the sense-organ has been fatigued and which does 
not per se impart a smell sensation to the observer. 
It is interesting now to determine the sensitiveness of the olfactory 
organ for guajacol with complete terpineol-exhaustion, for terpineol 
and guajacol with complete caproic acid-exhaustion. 
This is shown in the subjoined tables: 
