W. P. Riddell on Soleil’s Saccharimeter. 181 
While as devoid of this property, we may enumerate water, 
alcohol, pyroxylic spirit, pyroacetic spirit, olive oil, claret wine, 
(with perhaps a trace of left-handed polarization,) champagne, 
citric acid, mannite, liquorice sugar, glycerine, §c. 
It will be seen from the above that sugars of different kinds 
exert different effects in connection with polarization. These ef- 
ts Mr. Pereira classes as follows: 
ae ne eT aie 
2. Grape sugar, (Glucose of Dumas,) . : 
3, Uncrystallizable sugar, (Chulariose of Soubeiran. ) 
Unerystallizable sugar of honey,... . Left-handed. 
cc 
Right-handed. 
_ Unerystallizable sugar obtained by the ac- 
tion of acids on cane sugar, . . . 
Unerystallizable sugar of the juice of fruits, “ _ 
Unerystallizable sugar obtained by the al- 
teration of cane sugar. This constitutes 
the greater part of molasses, . . . “ - 
4. Mannite, 5. Glycerin, and 6, Liquorice sugar, 0 (zero). 
Process of Analysis.—Make the zeros of the compensator (on 
the scale and on the vernier) correspond perfectly; then revolve 
the analyzer by means of the thumb-screw. until the semi-discs 
ve one and the same uniform tint; the two discs will then be 
observed to have complementary colors: thus, if the ordinary disc 
or image be violet, the extraordinary one will be yellow ; if the 
former be red, the latter will be green, &c. The focus of the 
eye-piece may either be adjusted now, or after the liquor is intro- 
Uced into the observation tube; this is done by adjusting the 
distance between the two lenses, to suit different eyes while look- 
ing through the instrument: if done before the liqnor is intro- 
» Water should be placed in the tube, because the focus will 
‘ary somewhat if the tube be empty. 
gar) we weigh, by means of special weights accompanying Cler- 
get's apparatus, 16-471 grammes; place this in a matrass gradua- 
“= ON the neck to 100 and 110 cubic centimetres: pour in water 
Ul the matrass is filled to the 10U c. ¢. mark. if the mixture be 
sufficiently transparent, submit it to observadion in the tube of 20 
"0g agent must be mixed thoroughly with the liquor and allowed 
Saris, Vol. XV, No, 44.—March, 1853. S> 
