Xo. 116 difforofl in hnvini;- a smaller tu))Oi' and its avorasfc 

 yield was only 4 Ihs. ."i o/. ( r.».">(i iiraninics) or at the rate of 4 tons 

 0^ (wt. per neve. 



Xo. \l](\ was a^iiin lonf^or and made a return of on the average 

 11)S. 8 oz. (4309 grammes), one tuber attaining? 22 lbs. At the 

 rate of 91 Ibp. per hill, the yield per acre woidd be nearly 9 tons 



11 (Wt. 



The race of Philippine origin, Xo. 54, exhibited tubers which 

 are white fleshed, without any magenta sap, and they seemed to be 

 more susceptible to injury than the other similar tubers. The 

 average return was 44 lbs. (2041 grammes) which per acre works 

 ont at 4 tons 4 cwt. 



One Khasia hill race, Xo. IfiS, produced a tuber of the same 

 shape as these now under discussion, but with this difference, tliat 

 the knot of stem tissue at its head gave rise to many fleshy up- 

 rising shoots at- the end of the season's growth. There was no 

 magenta sap in the tuber, and the flesh was white, not yellowish. 

 The average yield of the plants was 4 lbs. 15 07.. (2240 grammes) 

 or per acre 4 tons 19 cwt. However it is thought that the race 

 for some reason has not yet had a fair trial. 



In review of these races with the slightly club-shaped tu])ers 

 it may be remarked that magenta sap when present is only found 

 in small C(uantities ; and that most of the races have clean-looking 

 tul)ers from the absence of small rootlets. As regards the stems one 

 of them (Xo. 136) possesses prickles. All but the last two, Xos. 54 

 and 168, are Fijian, and one of these last two namely Xo. 54, breaks 

 away from the group in its leaves having the venation more than 

 usually prominent. As regards the auricles of the largest leaves, 

 the Fijian races difl'er among themselves, but there" is a tendency 

 for these to be more nearly acute than they are in the foregoing 

 groups. 



The upper block on plate 2, represents a race in which the 

 tubers are not solitary, but are produced two, three or more to- 

 gether. This is a very difl^erent thing morphologically from the 

 branching wliich has been described above in regard to jilate 1, 

 for whereas in race Xo. 186 which served for the flgure on plate 1. 

 the tuberous root branches, in race Xo. 68 which is figured on 

 plate 2, and is now under discussion, there arise from the stem- 

 tissue at the head of parent tuber, more than one root destined 

 to swell into a tuber: it is indeed quite a difl'erent proceeding on 

 the part of the plant, to form two or more similar organs, where the 

 formation of one is usual, from the other case which is branch- 

 ing. Xo. 68 is a race from the Philippine islands. Its tubers 

 have a dark skin, free from rootlets; and under the skin there is a 

 layer of tissue holding magenta sap, the flesh being white. The 

 average yield was 11 lbs. 7 oz. (5188 grammes), one plant return- 

 ing 30 lbs. 2 oz. (13,664 grammes), which works out at 11 tons 

 9i cwt. per acre. 



