gh Prune of this 
. 
hed similar researches. eT hese experiments were specially carried out to ascertain 
$3 ch smells might find application as danger signals in mining work). 
% 
= - Allison and Katz made use of an apparatus called “Odorometer”, in order to 
The “apparatus was used as follows: — By means of an air pump, air was caused to 
eS flow. uniformly through several current-meters, and a U-tube filled with the liquid 
e 
ie | 
St containing the odoriferous body. The measured air saturated with the odour, was 
x i 
= now mixed with a measured. amount. of pure air and then led into a funnel, into which 
concentration of the smell-stuff in the air could be reckoned both by weight and by 
_ volume. After a single inspiration (“sniff”), the smell strength was assessed as follows 
by’ the person who had to carry out the whole of the ees OP: —I perceptible; 
Ae weak; Ill fairly strong; IV strong; V very strong. a ae 
oS 
io eh “ee 
a 
ie 
caitiicct | netoren V. ‘G Dnigodand S. H. Katz 2 have hee i 
~ estimate ‘the strengths of smells, and therewith the efficacy of the Setetl: stuff used. 
aut the experimenter had to. smell, for the purpose of determining the smelling power. The 
ie U-tube was. weighed before and after the experiment, and from the difference, the 
amount of smell-stuff was calculated which had passed over in the air. From this the - 
be We reproduce here the most important of the 24 smell- stuffs investigated: — 
Res ai Fine ( ; Smelt: atuitt, in parts by volumes ints, . Smell- stuff in milligrammes 
PS ik ee - 1000000 parts by volume of air, | in 1 litre of air. 
: sgt : ee Zee --:<Intensity of the smell. eae intensity of the smell. 
; aba tie Se en TOM Teen AVE en i I Iv Ye. 
| ee Artificial fonsk Ee ore ieee eee Fe OROOOOA A): Fa ces nee ais 
-lodoform . 2.) 2. 2 = 0.0184) 5 — i — 
x - Diamylsulphide en OF Pda ih Or tee Da oy OOM ri eO.00F 4s O:0115:," 0UOI2Is. OOPS 
_ Amyligovalerianate . BG ORT, iS OMS S40 12 vy, 0.012 0.018 0.039 0.072 0.082 
_ Propylmercaptane . . . 2 yi Gy orga le itz 0.006 0.020 0.028 0.043 0.054 
= Buti ac Boe en eA 7 G:F 1B OF 161 0.009 0.021 0.066 0.329 0.580 
- Valerianic acid Renee Or 20%. 0 AG) B32. 062 0.029 0.119 0.523 1.304. 4.036 
_ Methyl salicylate Pee AO A NAS ia 20 Bday OLF00c! 0145) 505179 5264) 
. Peppermint oil. . PE fe he a 0.024 0.032, 0.109 9.332 0348 
BS efi |. acetate . ares Irate ATs.) | 1236.) 1753 0.686 (24% (2.219) 4.A57 | 6.733 
i __ Chloroform see - 674 1389 2600 5887 9528 3.300 6.800 12.733 28.833 46.666 
+a / 
a Ae: is seen from this table that: — 
<a Page. With the same concentration of the siieltt stuff in he the intensity of the 
ae individual smells is very variable. | 
Se ; cy Concentration and intensity of the various smell-stuffs show no retion to each 
Be us other, that could be formulated into a law. 
| 3). ‘Sleep-effecting stuffs have lesser smell intensities, probably on account of their 
% é _benumbing influence on the olfactory nerves. > 
~ Physiological Effect of ‘Bssential Oils. — S. Furukawa has published a series i 
4 ? “investigations on the connection between chemical constitution and physiological effect 
e ~ the information from an abstract’). According to this, the alicyclic alcohols containing 
2 a CHOH group, their. esters and the lower aldehydes have a cooling taste, aromatic 
pal tte have he aod Cae and ketones a bitter taste‘). 
Bi ot a. Ct. Reports October 1904, 104. 1917, 123. — %) Journ. ind. eng. Chem. 11 t (1019), 131. — %) In America 
_ odoriferous substances are, already utilised for various industrial purposes. Thus the leaking of boilers and 
i | distributing tubes under high pressure, vis made known by peppérmint. or wintergreen oil. — *) Maximum 
_ concentration available. — *) Tokio Chem. Soc. As per Perfum. Record 19 (1919), 200. — §®) Cf. also Reports 
qi ne 1901, 114; October 1910, 156; 1916, 105; 1919, 107. 
- 
Be: Being am . 
fe 
_ of essential oils. Since the original work was not to be procured, we can only reproduce 
