586 



FOODS AND FOOD ADULTERANTS. 

 II. Acid phosphate of lime powders. 



NOTE. Since the rapidity with which a baking-powder gives off carbonic-acid gas 

 in the cold varies with the ingredients used, it was deemed worth while to test some 

 powders as follows: Forty-five grains (3 grams) of each was mixed with as little 

 shaking as possible with ^ ounce (5 cubic centimeters) of water, and the volume of 

 gas evolved in five minutes was measured. 



Per cent. 



Cleveland's yielded of its carbonic acid 49. 6 



Royal yielded of its carbonic acid 45. 6 



Horsford's yielded of its carbonic acid 68. 8 



A ' ' straight " burnt alum powder yielded of its carbonic acid 6. 3 



' III. Alum and phosphate powders. 



