14 BULLETIN 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 aveill variation in the soluble matter, 
but a large difference in 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. 
Alkalinity of ash (N/10 = | 
Ash. acid per gram ofsample). Protein. 
Ash- 
| Precipi free and 
No. ai oe poe ee 
Water |e con Wiaters| aa ccc Y1per| free 
Total. | soluble. eo soluble. see Motal-)) Total: ne solids. 
phuric 
acid. 
IP sop cent.| P. cent.| Cc. CE CoM A PACeit.| ea cent i cent. 
TO pet eee Rae Tee ee 19.16 | 10.68 8.48 8.85 14.05 | 22.90] 36.96 0.00 43.88 
VEY Paty ie ee em NEA Sd 23.39 | 12.03 |} 11.36 8. 75 14.40 | 23.15 | 29.42 0.00 47.19 
DLT AS ARIE I I 0 9 ay ea Ls 19.57 | 10.90 8. 67 7.15 13: 70"). 20285) | 33288 0. 00 46.55 
Via Se oe oe eke ames 2S eee we AS 8 17.60 | 12.30 5:30.) 10:70)| 10:30) |)" 21200 | 31-60 0. 00 50. 80 
SOLE soja, AS teen Se ee Ee 19.64 | 10.20 9. 44 5.15 | 14.40} 19.55 | 40.49 0. 00 39. 87 
OO se Se 55 nee eee Sone nee 19.18 9. 45 9.74 6.30 | 14.30} 20.60] 38.03 0.00 42.79 
AS BEF ite SE hoe: eet 18. 20 6.49 | 11.71 7.65 | 16.00] 23.65} 35.50 0.00 46.30 
As PE SET Seed EAR ae BOTA a 20. 45 9.88 | 10.57 8.35 | 16.20] 24.55 | 33.66 0. 00 45.89 
AOR ee Ue Ee ie ag Ce RE PAN) | ble 72 | wes y/ 8.25 | 15.60] 23.85 | 36.29 0. 00 40.52 
AS REA tae Sate a Se eI 20. 73 9.66 | 11.07 7.95 16.15 | 24.10] 36.26 0. 00 43.01 
LAID cee Bia Re a Say ce Ne 21.01 | 11.62 9.39 7.50 | 14.80} 22.30] 32.79 0.00 46. 20 
Aas Seale es lean Nae en: We 20.73 | 10.46] 10.27 8.00} 16.45 | 24.45] 37.17] 0.00] 42.10 
Bee oo, SR eae poset ee ee 18. 80 9.83 8.97 8.50 | 914.05 | 22:55 | 37.52 0.00 43.68 
AS ee aes As ae taeine oe | 18.79 8.34 10. 45 Wed ibe || PA |) Bis id 0. 00 46.05 
a) Ue gee he a 2 Pee eine Ser ages 18. 29 7.41 10. 88 7.20 | 15.65 | 22.85 | 38.80 0. 00 42.91 
I Aen are MR ee en es AR 17.49 9.45 8. 04 8.10 | 12.20] 20.30{ 37.97 0.00 44.54 
Do ace . bawe Beh tee ae 15.30 | 10.63 4.67 7.80 | 10.75 | 18.55 | 26.74 0. 00 57. 96 
DOE setae ee ice o aleon Sister ees 16.89 9. 94 6.95 9.30 12.40 21.70 | 30.42 0. 00 52.79 
