bee but a onan Siibou atom may, if connected” ‘with the ‘hydroxyl, 
odour. In the case of phenoles, tertiary carbon does not. prod 
smell. ‘Hydrogenization of the benzene ring _ in _phenoles alters. t 
the substitution of the hydroxyl hydrogen brings. about a ‘strong. 
a-naphthol ethers a are inodorous, but become odorous on fyaronea 
ik 8. \. nee in it, With aliphatic eigane the smell i hebine sideealee 
K atom, the climax being reached with a normal Cii-chain. The odour i 
At intensified by ethylene linkings. A tertiary carbon atom generally produ 
- smell, whereas it is of no consequence with acetophenones. In the case 
ketones, the characteristic Aue cannot be ascribed. to oe cause sf 
a camphorlike "chiell i : re 
aed Finally, Durrans discusses the different theories with segura to a. 
ty ot molecular weight, of ring closing, and of partial eae ania a 
presence of free partial valencies. 
~ hy iy i } preted 
on the sense of smell im bees and its importance with rebated to their 3 
at Since then, a second publication of the same gentleman has appeared on tl 
| According to Sprengel’s theory, the scent of the flowers attracts. ithe: ‘insec 
that has scarcely been mpd i a anybody. ss this unanimous 
publication. The latter have the a iariaee over the former of being i inc 
they can be used again after having been cleaned. The results: of 
. . BOA ple 
Rie ernene 
eas f 
1) Verhandl. der K. K. zoolog cau bhananerien Gesellschaft, Wienne 65 5 (1 
ber 1917, 127. ss fe Lecture sen on March 15th 1918 at the eae of the ep 
