| a new elie = -In aries) to meacure? fe shite a ae caien: yt 
constructed, and we described at the time*) the type recommended by 
C. van Dam”) has devised a different one. 
long and 0.6 cm. wide. They are ied up in ssinall copper tubes! eee can eee scre ‘ 
on a copper stick 10cm. long. The olfactometer is composed of a cilindrical en 
-air-chamber 1.5 m. wide and 16 cm. long, into which at the one end a glass-tube 8 cm. 
long and 0.6 cm. wide projects 6cm. The paraffin sticks are placed in this tube. 
At a right angle to the axis of the air-chamber, there is another glass- -tube 8 c 
in length and 0.6 cm. in width, at which one smells. The imbued paraffin stick 
introduced into the tube first mentioned and pushed in carefully until, at the oth 
tube, one distinctly perceives the smell. The distance between the paraffin stick 4 
the inner opening of the introductory tube corresponds to the intensity of smell. 2 
C. van Dam?) tried, with the aid of this olfactometer to determine the adsorptive 
power of various materials (gold, silver, platinum, iron, wood, ebonite, glass, quartz, 
bone [ivory2], Sc.) with regard to certain volatile liquids, such as ionone, eugenol; x 
acetophenone, nitrobenzene, and so on. He placed one drop of the liquid, by means” 
of a thin stick, on the bottom of a cylindrical flask, which was then closed. As soon — 
as the smell had spread uniformly, a cylinder of the material to be tested was introduced bi 
for one minute into the flask and then placed into the olfactometer. The results. | 
differed, although with some of the substances a relation between absorptive power 
and chemical constitution was noticeable. It was ipossibles however, to detent 
them quantitively. 
J. H. Kremer*) studied the same subject in another way. He showed, with thel 
aid of a spectroscopic method, that a liquid containing a lipoid, suspended lecithin, . 
or a fatty animal tissue in Ringer’s solution, adsorbed more odorous substance than 3 
water, if air saturated with some aromatic body, such as pyridine or camphor, was 
passed through. hae 
It is well known that essential oils are used as a protection against insects, especially 
gnats. J. Hamerton®) recommends, as especially effective against flies, a mixture of 
1 part pyridin, 1/2 part thymol, 5 parts safrole, 5 parts birch-tar oil and 88+/2 parts. 
spermaceti oil. Birch-tar oil and safrole shall hide the smell of the pyridin and, 
together with thymol, delay volatilization. The mixture does not irritate the skin and. 
is just as efficacious with people as with horses. It must be applied in a thin layer 
to the temples, the forehead, the ears and the back of the hands.: \ A 
\ 
As to the disinfecting power of the oil of pneletes wood, see p. 2t. 
The injection of turpentine oan in the treatment of wounds is . discussed on P. 
of this Report. ; 
wa 
1) Comp. Report October 1904, 104. — %) Arch. Neerland. Physiol. 1 (1917), 660; Journ. chen n 
(1917), 1. 606. — %) Arch. Neerland. Physiol. 1 (1917), 666; Journ. chem. Soc. ne (1917), 1. G07 = 
Neerland. Physiol. 1 (1917), 715; Journ. chem. Soc. 112 (1917), I. 607. — 5) Pharmaceutical Tourn. 9 as 
134. — §) Pfiigers Arch. d. Physiol. 167 (1917), 280; Chem. Zentralbl. 1917, TI. 238. ; 
