the author sets down a new facor of Sell: reneon in ee 
relations between the constitution and effects of chemical compounds on hi 
sense ‘Organs: the greatest successes were - obtained in colour neo 
i | 
obtain objective results. 
deficient. Henning’s system of smell?) also is incorrect, for smells. cannot pero 
eeOroine to chemical end lonone belongs to the same chemical ee 
Ruzicka defines as scent (perfume), a body which is soluble in the air she che 
reacts with substances in the olfactory mucous membrane, which: reaction 
the olfactory nerve. Formerly the chemical radicles characteristic of scents, 
OH, CHO, CO, COOR, and others, were denoted as. osmophoric groups®). Analogous. 
to the Ehrlich method of expression, Ruzicka calls the substances of the olfactory 
mucous membrane, through which the scents are fixed “osmoceptors”. The pe 
molecules entering the nose combine with those (primary) osmoceptors most ¢ ) ) 
of reacting with them, through which a certain ‘smell is then calee One ae t 
organism, then the smell remains constant. On the other hand, if the “os 
is given by the weak smell of concentrated violet perfume, and’ the i 
the organ of smell, when the same pertnane ina diluted state As. = preety Bec. | 
combined with different NESS EE 
1) Chem. Ztg. 44 (1920), 93,129. — %) Cf. Report 1917, 124. 
