J, Maier on detecting the adulteration of essential Oils. 275 
To show this calculation by an example, the power of rotation 
issupposed to be— 
of the pure oil of lemon =-+ 80°-573 
““* “« “  turpentine== — 40°-276 
PM mixture = + 18°70 
the quantity of the mixture = 20 c. cm. 
(20—2) 80°573—40-275¢ =20X18°70 
7611°46—80°5732—70°275¢ = 374 
1237°46 = 1228482 
‘ — a, 
The mixture contains equal parts of the pure oil and the adal- 
erating oil of turpentine. 
Optical behavior of several essential oils. 
Tested oil, Specific Power of Caan: 
ao tavity. rotation. 
il of absiuth, 0973 | 20°67 |) 
Oil of orange blossoms, | Soubeiran 
first product, +127°.43 & 
Oilof orange blossoms, Capitaine. 
second product, | 0°837 +-125°'59 
of bergamot, | 9°850() + 29°28 Biot. 
Oil of bergamot, fi t 
uct, | 0°850 + 49°:396| ) Soubeiran 
Oil of bergamot, last & 
ct, 877 — 6°573/ ) Capitaine. 
Oil of Caraway seed, | 0°897 rs hike | Maier. 
of lemon, 48 |+ 80°484| Biot. 
" Oi of lemon, 52 + 80°573; Maier 
4 Oil of lemon, (Grasse,) | 
ey produc 0°84 79°°749 
| Oil of lemon, (Grasse) | es » 
4 . off oduc 853 | 78°-156 
, . €mon, rectified, | 0°854 80°°916 : 
Oil of copaiva balsam, 0881 s gag | | Soubeiran 
Oil of copaiva balsam, C ry 
4 of? 98 | — 28%558| | “@Pilaine. 
gy, cubes 929 | — 40°159 
__ “Hof cubebs, free from 
One : 0°914 — 39°40 
een 0852 |— 90°30 |° Deville. ae 
4 oy op eniper, 0°855 waa-2: B51 Soubeiran & Capitaine. 
Oi ot 0°858 — 3%479) Maier. 
OF of wa Pentine, 08722(2)| — 397950) Biot. 
Ee Oi of cuPenti , 60 43°38 | Soubeiran & Capitaine. 
. ‘turpentine 0'865 at?" 25 Maier. 
