8 BULLETIN 666, U. S. DEPARTMENT OF AGRICULTURE. 
tables, however, will show that treatment with ammonia can be 
recognized by other changes in the analytical data. Sample 46 gives 
higher figures in all ashes and in all alkalinities than sample 44, due 
to the fact that it has been treated with both magnesium carbonate 
and potassium carbonate, the potassium carbonate increasing the 
water-soluble ash and the water-soluble alkalinity, and the magne- 
sium carbonate increasing the water-insoluble ash and the water- 
insoluble alkalinity. 
TABLE 4.—Comparison of treated and untreated cocoas. 
Alkalinity of ash (N/10 
Ash. acid per gram of 
sample). 
; Protein 
No. Alkali. ee (Nx 
Water-| Wter-| Water-| Water- | eo 
Total. soluble! insol- soluble,| 12S0l- | Total. 
uble. ‘| uble. 
Perncts |eRenctaler ence Ce. Ce. Ce! | Pence 
2 | 2.5 per cent pols carbonate=-ssss5- 8. 36 4.89 3. 47 4.00 4.90 8. 90 31.7 
ia] Untreated ast aeee passe oe eee 7.21 3. 76 3. 45 3. 20 4.90 8.10 31. 93 
15 | 2.5 per cent potassium carbonate, 10 per 
COntswatermen oss eh sea ose ee cmanenee 11.07 8. 87 2. 7.75 4.80 | 12.55 32. 20 
ie mWathoutiwatelsss- esse eeee aoe eee ee 11. 49 8.75 | 2.74 7. 25 6.15 | 13.40 33. 18 
| 
16 | 1.5 per cent potassium carbonate, 1.5 | 
per cent sodium carbonate.........-.-- ; 11.62 9.36) 2.26] 10.35 4.85 | 15.20 31. 92 
12 | 2.5 per cent potassium carbonate.......- | 11.00 8. 08 2. 92 7.35 5.40 | 12.75 33. 79 
22 | 1 per cent potassium carbonate.-.-....... ‘9. 20 5. 82 3. 38 5. 45 5.35 | 10.80 32. 59 
23a nGreated Maem serte seen aoe aoe ee sree 8.57 3.54 | 5.03 2.72! 5.50] 8.20 29. 84 
20 | 2.5 per cent sodium carbonate..........- 19, 45, |) © 85174) = 13528) | ) 11015) 5. 25s ete 40 oes 
19); |\GQUntreated soir ose sec cee cee ce 7. 94 2. 81 5. 13 3. 05 5. 05 8.10 30. 32 
26 | 4 per cent ammonium carbonate.........| 7.66 2. 87 4.79 2. 25 5. 10 7.35 36. 18 
258) Umtrea ted as soa eee Se leaanceeee ae 7. 54 2.73 4.81 2.40 HS 1185 TERS 33. 31 
| 
28 | 1 per cent potassium carbonate........-- 8.31 5. 98 2.33 5. 10 4. 80 9. 90 33. 04 
29 | Untreated eice tess teste ote eoee er 7.37 3. 88 3. 49 3.35 4. 60 8. 00 32.97 
31 | 2 per cent sodium carbonate...........-- 10. 23 7.54] 2.69) 8.601 5.30} 13:90) 29562 
30} Untreated ------- 2 ~~ 22-2 te 8. 34 4.61 3.7 4.05 5. 25 9. 30 31. 48 
33 | 3 per cent sodium bicarbonate.........-- 8. 76 6. 54 2. 22 6. 65 5.05 | 11.70 32. 87 
S24 WWintreate Gee sse seas ia Sete Ree ee ya 7.16 2.99 ZA || 9h 6S) 4.80 7.35 33. 48 
46 | 1 per cent (magnesium carbonate and 
potassimmcarbonate) sesso esses eee 7. 87 3. 52 al Bey |i 8h 11s 5. 05 8. 20 31.31 
44: Untreated 22 8en2 aes oa2 seams eee 6. 94 2. 66 4, 28 | 1.90 4.70 6. 60 30. 02 
Comparison of Tables 2 and 3 shows that the maximum percentage 
of total ash in the alkali-treated cocoas is 2.65 above that in the 
untreated cocoas, and the average is 2.11 higher. A wider varia- 
tion is shown in the water-soluble ash, where the maximum per- 
centage in the alkali-treated is 5.82 higher than the maximum of 
the untreated cocoas, and the average is 3.81 higher. With the 
exception of one sample of the treated cocoa, which has had added 
to it 1.75 per cent magnesium carbonate, the maximum percent-. 
age of water-insoluble ash in the untreated cocoa is 1.56 higher than 
in the treated cocoa, and the average is 1.27 higher. The soluble 
