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, <luc 

 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. 



No. 



Alkali. 



2.5 per cent potassium carbonate . 

 Untreated 



2.5 per cent potassium carbonate, 10 per 



cent water 



Without water 



1.5 per cent potassium carbonate, 1.5 



per cent sodium carbonate 



2.5 per cent potassium carbonate 



1 per cent potassium carbonate . 

 U mreated 



Ash. 



Total. 



2.5 per cent sodium carbonate. 

 Untreated 



4 per cent ammonium carbonate . 

 U ntreated 



1 per cent potassium carbonate . 

 Untreated 



2 per cent sodium carbonate. 

 U ntreated 



3 per cent sodium bicarbonate. 

 U ntreated 



1 per cent (magnesium carbonate and 



p jtassium carbonate) 



Untreated 



Per ct. 

 8.36 

 7.21 



11.07 



11.49 



11. G2 

 11.00 



9.20 

 8.57 



11.45 

 7.94 



7.G6 

 7.54 



8.31 

 7.37 



10.23 

 8.34 



8.76 

 7.16 



7.87 

 6.94 



Water- 

 soluble, 



Per ct. 

 4.89 

 3.76 



8.87 

 8.75 



9.36 

 8.08 



5.82 

 3.54 



8.17 

 2.81 



2.S7 

 2.73 



5.98 

 3.88 



7.54 

 4.61 



6.54 

 2.99 



3.52 

 2.66 



Water- 

 insol- 

 uble. 



Per ct. 

 3.47 

 3.45 



2.20 

 2.74 



2.26 

 2.92 



3.38 

 5.03 



3.28 

 5.13 



4.79 

 4.81 



2.33 

 3.49 



2.69 

 3.73 



2.22 

 4.17 



4.35 

 4.28 



Alkalinity of ash (N/10 

 acid per gram of 

 sample). 



Water- 

 soluble. 



Cc. 



4.00 

 3.20 



7.75 



10.35 

 7.35 



5.45 

 2.72 



11.15 

 3.05 



5.10 

 3.35 



8.60 

 4. 05 



6.65 

 2.55 



3.15 

 1.90 



Water- 

 insol- 

 uble. 



Cc. 



4.90 



4.90 



4.80 

 6.15 



4.S5 

 5.40 



5.35 



5.50 



5.25 

 5.05 



5.10 

 5.15 



4.80 

 4.60 



5.30 

 5.25 



5.05 

 4.80 



5. 05 

 4.70 



Total. 



Cc. 



8.90 

 8.10 



12. 55 

 13. 40 



15. 20 

 12.75 



10.80 

 8.20 



16. 40 

 8.10 



7.35 

 7.55 



9.90 

 8.00 



13.90 

 9.30 



11.70 

 7.35 



8. 20 

 6. 60 



Protein 



(Nx 

 6.25). 



Per ct. 

 31.72 

 31.93 



32.20 

 33.18 



31.92 

 33.79 



32. 59 

 29.84 



29.57 

 30.32 



36. IS 

 33.31 



33.04 

 32. 97 



29. 62 

 31.48 



32. 87 

 33.48 



31.31 



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 



