190 STUDIES IN INDIAN SUGARCANE SEEDLINGS 



COLOUR OF CANE AND SUCROSE. 



Correlation 10. 



The study of vaiious other possibk; conelatioiis has been coiiniiciiced, but 

 the uunibers of batches of seedlings tested are not as yet suihcient for definite 

 results to have been obtained. The measurements thus far referred to have this 

 advantage, that there is no doubt or difficulty in preparing the lists of variation. 

 It is otherwise with less definite characters. The universal presence or total 

 absence of any feature is rare in any batch of cane seedlings, alnu)st all grada- 

 tions being observable. Thus, with ivory markings on the stem, the seedlings 

 vary from those with abundant markings, through all stages, to those without 

 any at all, and it is extremely difficult to grade them into any series. Colour 

 has. as already stated, special difficulties, but it lias been carefully observed, 

 because of the interesting fact that a striped parent has few or no striped seed- 

 lings. The analysis given below follows the classification laid down in the 

 section of Variation in Colour of the canes (p. 145), namely, (1) Greens without 

 any trace of red or vinous tinge, (2) Greens with vinous or brownish tii\gc, 

 (8) Pur|)les. Reds and Clarets, (4) Striped canes. A table is appended with the 

 comparative sucrose content in the juice for all these colours in a luimber of 

 batches of seedlings, and ceitain facts seem to hold gen.eially, although the 

 ChiUans, with striped parentage, do not agree with the rest. From the table 

 it appears that the greens usually have the lowest sucrose, the greens with 

 brownish tinge the highest, closely followed by those with vinous tinge. 



In Karan (337) greens are lowest but equal vinous, ]nn])le anil red, and 

 claret and brown are distinctly highest. 



In Saretha (selfed 50) green is distinctly lowest, then red. then vinous and 

 brown tinged, which an', highest. 



In Naanal (84) gree.i- is distinctly lowest and» brown and vinous equal 

 and highest. 



In Poovan (only 14) green is distinctly lowest, then vinous equals ])urplc 

 and red and brown are much the highest, but the luimbers are too small. 



In Kaludai Boothan (56) green is slightly lower than brown and vinous, 

 which are equal. 



In Chilian red is slightly higluist. claret slightly lowest. gree]i. bniwn, 

 vinous and j)urple being ])ractically equal (486 seedlin.gs, with striped parent). 



In C/teiii (25) greens absorb 80% of the whole, and comparisons nvr. not 

 well possible. 



