On Citric Acd. 



lU 



to saturate the acid in an ounce measure of lemon-juice, the 

 same number of ounces of pure rhomboid crystals of citric acid 

 may be obtained from every gallon, wine measure, of the said 

 juice. 



No. III. 

 A Table of the quantity of pure crystals of citric acid which may 

 be obtained from different parcels of lemon-juice, as indicated 

 by the quantity of dry sub-carbonate of soda required for its 

 saturation. See page 108. 



To prevent the possibility of any misconception respecting the 

 nature of these tables, it may be proper to state an example of 

 the use of each. For instance, if it be required to examine a 

 parcel of lemon-juice by the dry salt of tartar, ail that is neces- 

 sary is to take an ounce' measure, or the sixteenth part of a wine 

 pint of such juice, and having noted the number of grains re- 

 quired for its saturation, to look for the same number in the se- 

 conti column of the first table, and opposite thereto, in the third 

 column, will be seen the quantity of crystals of citric acid which 

 may be obtained from a gallon of such juice. The Table No. II. 

 is constructed in the same manner, for the use of a solution of 

 salt of tartar to be jjrepared as directed at page 108. The 

 Table No. III. is contrived in a similar way, for the use of the 

 sub- carbonate of soda to be dried in the manner prescribed at 

 page 108. 



No. IV. 



