152 STUDIES IN [XDIAX SlUJARCANK SKK 1)1,1 XfiS 



Til oidei- to form an cstiiuatc of the iclntixp richness of the juice in the 

 seedlings, tlie [ilan usually foNowfil in oflicr couiitrics was a1 first employed, 

 namely, to consider the Inilk analysis at croi) time l>ut cei'tain ))eeiiliarities 

 in some of the curves obtained led to a full study of the whole series of bulk 

 and ])etty analyses, and it was seen that to take the bulk alone iiito considera- 

 tion might be mislead.ing. F.)r instance, during the 1914 harvesting season 

 in order to test the ri])ening of the canes, certain of the Xaanal seedlings were 

 analysed once a foitnight. and the results are given in the table appended. 



Forhiighthi (I It'll ii-ses of the juice in Ndaiiol Secdiiiu/s (1*»12-14). 



Madras ( Siier.",', ()-63 6-6o 7-32 6-09 7-71 6-87 o-M) (i-79 7-06 6-06 ... 



No. 1411 1 Glue.";, 2-94 2-38 2*08 1-60 1-79 167 1-47 1-28 1-30 1-47 ... 



Madias / Sucr.% 1026 9-13 10-83 in-.39 9-89 in-,32 1053 7-52 931 l()-()4 1(1-63 



No. 1439 I Glnc.% 208 2'08 1-67 1-92 1-67 12.5 114 Ml M6 1-25 0-67 



Madi-.is f Siicr."o 479 6-22 7-30 7-84 703 6 83 586 13-40 14-48 7-21 



No. 1454 1 Glnc.% 217 2-08 1-39 1-60 156 138 I'll 040 32 0-17 ... 



Madras j Sucr."o 10-31 11-19 11-94 1348 14-00 14 47 13-(K) 1') 31 928 8-46 ... 



No. 1474 I Glue.",, 1-72 1 67 1-53 139 104 1-16 074 O-JO 063 061 



Madras I Sucr,",, 757 8 18 9-53 9-36 S-Sl 12-53 10 92 10 71 8-00 9-44 9-93 

 No. 1490 i Glue.",, 1 67 1-61 MO 1"20 101) U-68 0-54 36 0-54 0-37 0-.S3 



Fn all ot these there is a steady fall in glucose jjercentage fi'om start to 

 hnish. In Nos. 1 fl I and 14.'>9 the sucrose varies little throughout the series, 

 and a very fair idea would be obtained of the lichness of the juice from the 

 bulk analyses alone. In Nos. 1474 and 1490. on the other hand, there is a 

 fairly steady rise in sucrose to a ma.ximum, followed by a decline towards 

 crop time, showing ap])arentl\- that the canes were overrijx' when linally 

 analysed in bulk, it is thus seen that the glucose determination alone is not 

 sufficient to determine ripeness in a cane, as it continues to fall when the cane 

 is overripe. The figures in No. 1454 show extraordinary variations, and no 

 reliable oj)inion can be formed from them as to the normal lichness oi the 

 juice. On the whole, it will be observed that the bulk analyses is not always 

 a safe guide, and, after an examination of other cases, where ])etty and bulk 

 analyses were available, it was finally determined to select, from the .seiies of 

 analyses of any seedling, that containing the highest reading of sucro,se. In 

 doing this, however, due i(>gar(l has l)een paid to the percentage of glucose 

 and the botanical description made at crop time. Where the former was 

 unusually high or a note was recorded in the latter that the canes were innna- 

 ture oi- dried up and overi-i|)e. the analysis was rejected. After all, the main 

 purpose of these analyses is to obtain a c()mi)arative figure of a .seedling'.s 

 merit, and it is felt that this will be best obtained by some such method 

 as that adopted. It may perhaps give a rather high figure for the general 

 richness of j'uice in the seedlings grown on the farm, but it is, again, thought 



