— 134 — 
when the weather is very unfavourable, for a few hours in an inhala- 
tion-room, where large spray-diffusers, attached to the ceiling, minutely 
diffuse under high pressure water or a normal solution of common salt, 
to which traces of essential oil have been added. In such a room 
the patients walk chatting up and down, and from time to time make 
the prescribed deep inhalations. These have a deodorising and expector- 
ating effect, in spite of the fact that only traces of oil are thereby 
brought into action. Systematic experiments on pure cultures of tu- 
bercle bacilli and other microbes found in the lung, made to test the 
antiseptic effect of essential oils, and of constituents of those oils, are 
urgently needed. It is hoped that this reference to them may lead 
to such experiments being made. 
J. J. Weber, Leipzig. 
