181, 182] Analysis of the Juice 1 15 



afterwards. First get together the apparatus and solutions 

 required, so that no time may be lost after the work has once 

 begun. 



Apparatus. A 50-c.c. pipette ; 

 A 20-c.c. pipette ; 

 A 10-c.c. pipette ; 

 Two measuring flasks, 100 c.c. \ 

 A shallow evaporating basin (weighed) ; 

 A 4-oz. beaker ; 

 A thermometer j 

 A sp. gr. bottle. 



Solutions. Saturated solution of lead acetate \ 

 Strong lactic acid. 



181. Immediate Treatment.— Note the temperature. 

 Glucose. Measure out 10 c.c. and run it into one of the 



ioo-c.c. flasks. Add about 5 c.c. of distilled water, then 10 c.c. 

 of the lead acetate solution. Make up to 100 c.c. with water, 

 shake well, and allow to settle. 



Total Sugar. Measure out 20 c.c. of the juice into the 

 other ioo-c.c. flask, and treat in exactly the same way. 



Total Solids and Ash. Measure out 50 c.c. of the juice, 

 and run into the evaporating dish. Place this on the water 

 bath to evaporate. 



Soluble Albuminoids. Measure out 50 c.c. of the juice into a 

 4-oz. beaker ; add six drops of strong lactic acid ; stir well, cover 

 with a clock glass, and allow to stand for twenty-four hours. 



Take the temperature of the juice again. 



182. If these operations have been performed with a fair 

 amount of rapidity, the temperature of the juice will not have 

 appreciably changed. This is of importance, as any heating 

 or cooling of the juice will alter its specific gravity, and the 

 results obtained will not be strictly comparable. 



1 2 



