The Sweet Potato and its Cultivation. 341 



The following percentage results were obtained l)y analysis : — 



Entire Outer Central 



Tuber. Layer. Core. 



1. Covivion six-months — 



Original weight of tuber . 307 gms. 360 gms. 360 gms. 



Water 70.55 67.08 68.72 



Protein (N x 6.25) 94 .97 .77 



Fat 63 .40 .54 



Nitrogen-free extract ... 26.22 29.93 28.58 



Fibre 61 .61 .47 



Ash 1.05 1.01 .92 



Sugars: lleducing 4.47 — — 



Non-reducing ... 1.59 — — 



Specific gravity of tuber . 1.08 — — 



2. Red-skiivned tlirec-months — 



Original weight of tuber . 110 gms. 710 gms. 710 gms. 



Water 80.02 82.41 82.49 



Protein (N x 6.25) — .65 .59 



Fat - .42 .47 



Nitrogen-free extract .... — 14.66 14.97 



Fibre ... — .68 .56 



Ash — 1.18 .92 



Sugars: Eeducing 2.68 — — 



Non-reducing ... 2.92 — — 



Specific gravity of tuber . 1.04 — -^ 



3. Y ellow-slanned three- months — 



Original weight of tuber . 530 gms. 670 gms. 670 gms. 



Water '. 77.06 73.72 78.66 



Protein (N x 6.25) 68 .71 .47 



Fat 21 .20 .15 



Nitrogen-free extract . ... 20.42 23.96 19.91 



Fibre 80 .59 .40 



Ash 83 .82 .41 



Sugars: Reducing .46 — — 



Non-reducing ... 2.69 — — 



Specific gravity of tuber . .90 — — 



4. British East African white-skinned — 



Original weight of tuber . 470 gms. 520 gms. 520 gms. 



Water 70.61 73.06 75.91 



Protein (N x 6.25) 1.34 1.18 .89 



Fat ... 46 .33 .27 



Nitrogen-free extract . ... 25.54 23.83 21.73 



Fibre 77 .62 .45 



Ash 1.28 .98 .75 



Sugars: Eeducing 5.24 — — 



Non-reducing ... .81 — — 



Specific gravity of tubei- .1.05 — — 



Samples Nos, 1 and 3 were analysed twenty-four hours after their 



arrival in the laboratory, and samples Nos. 2 and 4 five days after 

 arrival. This may, to a certain extent, account for the fact that in 



