14 



111 "1 .1 I. TIN 666, U. S. DEPARTMENT OF AGRICULTURE. 



soluble matter. The color value has also been increased. .Sample 29, 

 however, shows from the analysis that a certain percentage of alkali- 

 treated cocoa is present with it, so that the variations are not as great 

 as might be expected. Sample 31, treated with 2 per cent sodium car- 

 bonate, shows a comparatively small variation in the soluble matter, 

 but a large difference hi the color value. Sample 33, treated with 3 

 per cent sodium bicarbonate, shows a diminution of the soluble matter, 

 but an increased color value. Sample 46, which has been treated 

 with 1 per cent of a mixture of magnesium and potassium carbon- 

 ates, shows less soluble matter than a like sample untreated, but 

 shows some increase in the color value of the solution. 



COMPOSITION OF THE WATER-SOLUBLE MATTER IN UNTREATED AND 



TREATED COCOAS. 



Tables 5, 6, and 7 give the analyses of the water-soluble matter as 

 calculated back to the original cocoa. It was deemed advisable to 

 calculate the composition of the water-soluble solids of the cocoa. 

 This calculation is given in Tables 8 and 9. Comparison of these 

 tables shows that the alkali treatment makes a marked difference in 

 the composition of the water-soluble matter. Naturally the water- 

 soluble matter from the alkali-treated cocoas contains a higher per- 

 centage of ash (4.05 on the average), a higher percentage of soluble 

 ash (9.10 on the average), and less insoluble ash (5.05 on the average). 

 The alkalinities of the ash are also higher on the treated cocoas, and 

 the percentage of the total calculated protein is higher by 1.04 on the 

 average. 



Table 8. — Composition of the water-soluble matter of untreated cocoas. 





Ash. 



Alkalinity of ash (N/10 

 acid per grain of sample). 



Protein. 



Ash- 

 free and 

 pro- 

 tein- 

 free 

 solids. 



No. 



Total. 



Water- 

 soluble. 



Water- 

 insolu- 

 ble. 



Water- 

 soluble. 



Water- 

 insolu- 

 ble. 



Total. 



Total. 



Precipi- 

 tated 

 by 1 per 

 cent 

 sul- 

 phuric 

 acid. 



19 



P. cent. 

 L9. L6 

 23.39 



19.57 



I7.6H 



19.64 

 19.18 

 18.20 

 20.45 

 23.09 

 20. 73 

 21.01 

 20.73 

 is.. so 

 18.79 

 18. 29 

 17. 19 

 L5.30 

 16.89 



P. cent. 

 10.68 

 12.03 

 10.90 

 12.30 

 10.20 

 9.45 

 6.49 

 9. s.s 

 11.72 

 9.66 

 11.62 

 11). 46 

 9.83 

 8.34 

 7.41 

 9. 15 

 in 63 

 9. 94 



P. cent. 

 8.48 

 11.36 

 8.67 

 5.30 

 9.44 

 9.74 

 11.71 

 10.57 

 11.37 

 11.07 

 9.39 

 10.27 

 8.97 

 10.45 

 10.88 

 8.04 

 4.67 

 6.95 



Cc. 

 8.85 

 8.75 

 7.15 

 10.70 

 5.15 

 6.30 

 7.65 

 8.35 

 8.25 

 7.95 

 7.50 

 8.00 

 8.50 

 7.70 

 7.20 

 8.10 

 7.80 

 9.30 



Cc. 

 11.05 

 14.40 

 13.70 

 10.30 

 14.40 

 14.30 

 16.00 

 16.20 

 15.60 

 10. 15 

 14.80 

 16. 45 

 14.05 

 15.35 

 15.65 

 12.20 

 10.75 

 12.40 



Cc. 

 22.90 

 23.15 

 20.85 

 21.00 

 19.55 

 20.60 

 23.65 

 24.55 

 23.85 

 24.10 

 22.30 

 24.45 

 22.55 

 23.05 

 22.85 

 20. 30 

 18. 55 

 21.70 



P. cent. 

 36.96 

 29.42 

 33.88 

 31.60 

 40.49 

 38.03 

 35.50 

 33.66 

 36. 29 

 36.26 

 32.79 

 37.17 

 37.52 

 35.16 

 3.S..S0 

 37.97 

 26.74 

 30.42 



P. cent. 

 0.00 

 0.00 

 0.00 

 0.00 

 0.00 

 0.00 

 0.00 

 0.00 

 0.00 

 0.00 

 0.00 

 0.00 

 0.00 

 0.00 

 0.00 

 0.00 

 0.00 

 0.00 



P. cent. 

 43.88 



23 



47.19 



25 



46.55 



32 



50. SO 



36 ... 



39.87 



39 



42. 79 



40 



46.30 



41 



45.89 



42 



40.52 



•1.', 



43.01 



1 ! 



46.20 





42.10 



47 



43.68 



48 



46.05 



51 



42.91 



54 



44.54 





57. 96 



56 



52.79 



