C. A. BARBER 191 



been obtained, but this interpretation is open to doubt. The results of the 

 measurements are as follow : — 1916, based on averages of 20 canes of each 

 variety, Saretha 12-4", Sunnabile H'G" : 1917, measurements of 20 canes, 

 Saretha 11-9", Sunnabile 11-9" : measurements of 10 canes in the laboratory, 

 Saretha 11-95", Sunnabile IS* 02". The agreement of the two 1917 measure- 

 ments is very close. 



(15) Module. This empirical expression is obtained by dividing the 

 average length by the greatest %vidth, that at the base. It is designed to give 

 some idea of the shape of the leaf sheath and is included because it has been 

 found so useful in the cane and the lamina. We have seen that the sheath 

 is wider at the base in the Smmabile group, while the length of the sheath, longer 

 in the 1916 results in Saretha, is practically the same in the two groups in 

 1917 measurements. It is not surprising that the Smmabile sheath has a 

 lower sheath module. Also that this module is higher in the Mesangan section 

 than in the Sunnabile group. The figures are, for 1916, Saretha group 4-0 ; 

 Simnabile 3-5 ; for 1917, Saretha I'l, Smm.abile 3-7— figures which show 

 sufiicient agreement. The figm-es in. the Katha and Mesangan sections of the 

 Saretha group, in 1917, are 3*8 and 4*4 respectively. 



(16) Number of sheaths per cane. The sheaths are, as might be expected, 

 more numerous in the Smmabile group, although there is hltle difference in 

 the poorer grown 1917 crop. The figures were, in 1916, Saretha 35, Sunnabile 

 45 ; in 1917, Saretha 29, Smmabile 30, the figures for the Katha and Mesangan 

 sections being 30 and 28 respectively. 



(17) The variations in sheath length in different parts of the cane. As in the 

 length of joint, the length of sheath was measured by foot rule divided into 

 tenths of an inch, in 20 canes of each variety, both in 1916 and 1917. In 1916, 

 7 varieties of the Saretha group and 10 of the Smmabile were measured, and 

 the canes were over-ripe. In 1917, the number of varieties were 18 an.d 15 

 respectively, but some of these have been ruled out, in that it was not possible 

 to obtain fair averages because of the large mimber of missing sheaths. It is 

 natural that differences would be lessened in. the latter case and, perhaps, more 

 reliance is to be placed on the 1916 results. The folio wng are the averages 

 obtained in the 1916 measurements, the len^-hs of sheaths being recorded, 

 from base to apex, in inches. 



1916. Saretha group. 12*2, 12'6, 12-9, 130, 13*2, 13-3, 13-2, 13-2, 13-1, 



12-9, 12-7, 12-6, 12-5, 12-4, 12-3, 12'3, 12-2, 12*2, 



12-3, 12-3, 12-0, 11-9, 11-8, 11-6, 11-5, ll-i, 11*2, 

 [11-0, 10-8, 10-1, 8-8, 5-2, 1-3; 0-3, 0*1. 



