374 



Citiners have Ijomi planted on the slope Ijehind the Direetor's honso. 

 for the coinenienee of Avatehing them: hut the soil is tliere very 

 inferior: and therefore as soon as possihle the plan adopted has 

 been to remove the stock to better soil in the f^conomie (lardens. 

 Hnt before this can be done the stock lias had to l)e l)iiilt up from 

 the small l)e<iinniu,Si-, and in the cases where the ori,i,ni)al tuber 

 arrived in a verv bad state moi'c than one year has been re<iuisite. 



All the races to l)e reported on below, have had a year of culti- 

 vation in Block 14 of the Economic (Jarden in a place where the 

 soil is a moist and c^ood loam with but one fault — that it contains 

 too much rottino' timlier. 



Tliere is an axiom in work of the nature of this study — 

 that tlie plants must exist under the best possible conditions, for 

 otherwise they do not exhibit their characters fullv. ft has been 

 impossible to give them better conditions. 



In 1914 when the work now in hand was commenced in Sin<fa- 

 pore, plantintj was done in the first week of February, exce])t for 

 a few tul>ers received too late, and diggino^ was done in the third 

 week of October, so that the crop was on the ground for 8^ months. 

 For 1915 planting was done in the first week of December, 1914, 

 and digging in the very end of Se])tember, 1915, so that the crop 

 was on the ground for almost Kt months. For 191G ])lanting was 

 done in the second week of Decemljer, 1915, and up to the Xew 

 Year; and digging was done in tlie end of August and in the first 

 half of September, 1916, so that the crop was on the ground for 

 9 months. 



In 19 If) it occupied an area of rather more than one quarter 

 of an acre. 



Xo. of sets planted 643 



Area o(-cupied 12,51.S scj. I\'ct or .••3H7 acre = l.f6.") ccntaires. 



Yield, all included, 4398| His. = 1995.T kilos. 



Xo. of races represented. 



of local origin . . . . . . . . 2 



of Indian origin . . . . . . 14 



of Saigon origin . . . . . . 4 



of Philippine origin . . . . . . 37 



of Australian origin . . . . . . 1 



of (luam origiu . . . . . . 4 



of Caroline origin . . . . . . 1 



of Fijian origin . . . . . . 20 



of West African origin . . . . lo 



of uncertain origin . . . . . . 2 



95 



