W. P. Riddell on Soleil's Saccharimeter. 183 
From the solution prepared, (defecated and decolorized, if neces- 
sary, as explained,) fill a small matrass to the mark on the neck 
indicating a capacity of 50 c.c., complete the filling of the ma- 
trass to the mark on the neck indicating a capacity of 55 c.c., by 
pouring in {rong hydrochloric acid; place the matrass in a wa- 
ter bath kept uniformly at a temperature of 68° Centigrade, con- 
tinue it there for 15 minutes, and the inversion will be complete, 
Throw this upon a paper filter, and allow the liquid to flow di- 
fectly into the tube of 22 centim. length, which is provided with 
4 Special upright tube for determining the temperature which ex~ 
etts a considerable influence on the rotatory power of inverted 
liquids, and must be carefully noted ; it is better to make the ob- 
servations at some uniform temperature, as for instance 28° or 
30° Centigrade. 
If the rotation be to the left, add it to the rotation to the right 
determined previous to the inversion; if the rotation be still to 
tight, subtract it from the right-handed rotation previously 
determined. In the table, which accompanies Clerget’s appara- 
lus, under the temperature corresponding to the temperature at 
Which the observation after inversion has been made, seek the 
number corresponding to the sum or difference of the degrees of 
Totation determined by the observation, follow to the right hand 
the line of horizontal figures to the column marked A, in which 
sie be found the figures expressing the per cent. by weight of 
“fin the sample; or continue to the column marked B, in 
which will be found the figures expressing the number of grammes 
Per litre contained in the given liquid. Either of these will ex- 
Press the title of sample under analysis—the former gives the title 
by weight, the latter, by volume. ‘ 
t. Clerget, in his ‘ Memoire a la Société d’Encouragement, 
on the analysis of sugars, &c., (where a very full description of 
a apparatus, &c. used in analysis is given,) recommends the 
r fish-glue; dilute this with one deciliter of white wine or 
of diluted alcohol. Treat the mixture with water till the vol- 
Water, till the oxyd which is not dissolved, has become white.” 
When bone-black is used, its volume had best be about one- 
