1&2 SttTDIES IN INDIAN SUGARCANES, NO. til. 



Siiiinabile group. IM, 11-3, 11-5, 11'5, 11-7, ll'fi, J 1-7, 11-8, 11 -D 

 11-8, ll'S, 11-8, 11-8, 11-7, 11-6, 11-8, 11-9, 12-0, 

 12i, 12-1, 12-0, 12-0, 11-9, 119, 11-8, 11'7, 11-7 

 11-5, 11-3, 11-3, 11-3, 11-1, 10-9, 10-7, 10-8, 10-9, 

 10-7, 10-3, 9-6, 7-7, 3*3, 0-8, 0-2, 0-1. 



These figures plotted out on curves, show some interesting characters 

 (Chart III). 



(18) Carves. In the Saretha group, in 1916, the curve commences high, 

 ascends steeply to an early maximum, then descends steadily with a slight 

 indication, of a second maxinuim half way down, and. the curve leaves the 

 paper considerably sooiier thaii that of the Sunnabile group. The curve of 

 the latter commences low, rises gradually to a first maximum and attains its 

 highest point very late. It crosses the Saretha curve about half way along 

 its course an.d then, descends steadily but less steeply than in. Saretha and 

 shows an. indication, of a fin.al small maximum before it leaves the paper. 

 The crosses mark the position of the eighth sheath from the en.d, and those 

 beyond may, for convenience, be considered all immature and need not concern, 

 us. The curve in, Sunnabile is nmch loii.ger, the number of sheaths before the 

 last eight being 37 as against the 27 in Saretha. Comparing the two curves, 

 that of Sunnabile is longer, lower, flatter, characters which we noted in the 

 curves of the lengths of joint in. the identical sets of canes. In fact, there is 

 considerable similarity between leaf sheath and joint length curves in any cane 

 although this resemblance is not close enough to establish a defiji.ite correlation 

 between, join.t and leaf sheath. 



The 1917 measurements were taken, in. a much larger luimber of varieties 

 in each group and the canes were measured when only n.ine months old, to ensure 

 the presence of sheaths an.d. leaves in good condition. But, unfortunately, 

 the growth was poor in most of the varieties and especially so in one or- two — 

 being nothing like so good as in the previous year. The number of joints and 

 consequently of leaf sheaths were much beloM- the average and, generally, 

 normal differences were much reduced. The following are the figures obtained 

 in 1917 for lengths of successive leaf sheaths. 



Saretha group ; averages of 18 varieties with 20 can.es in. each variety 

 in inches : 



11-1, 11-7, 12-2, 12-4, 12-7, 12*8, 12-7, 12-6, 12-5, 12-4, 12-3, 12-2, 12-1, 

 11-8, 11-7, 11-5, 11-4, 11-3, 11-2, 11% 11-1, 11-0, 10-4, 9-7, 8-5, 5-1, 1-3, 

 0-2, 0-1. 



