88 INHERITANCE OF RED COLOUR IN JUTE. 



pure dark red plot and No. 9 contain.^ about 85 per cent, ut' dark 

 red plants. In the remainder there is no satisfactory appi'oxinia 

 tion, either to one shade of red, or to a constant ratio between 

 the different types. We hope to pursue this point further. In 

 the present sea.«ion (1911), the .seed was .sown rather too close 

 together in the plots ; so that it was found necessary to thin out 

 a number of plants when they were about six weeks old. At 

 this stage, while it is perfectly easy to distinguish between a 

 pure green plant and one containing red colour, it is more diffi- 

 cult to say whether a red plant of a particular shade will retain its 

 colour in unchanged intensity, throughout its growth. Of course, 

 the thinning, just referred to, involved an immediate classitication 

 of the plants taken out, and it is just possible that an error has 

 crept in here, as some of the plants counted at the time of thin- 

 ning might have been apportioned differently at a later stage. 

 Next season, arrangements will be made for the plants u< 

 be far enough apart in the plots to avoid the necessity foi 

 thinning. 



In discussing the question of changy of colour, it is worthy 

 of note that exposure to sun-light appears to have a certain effect 

 in deepening the red colour in a plant. For instance, the upper 

 portions of a plant in the centre of a well-grown plot are the only 

 ones which receive any large amount of direct sun-light. It is 

 often seen that, under such conditions, the upper branches of a 

 plant, which contains only a small amount of red colour, have a 

 distinctly pink tinge ; while its stem, in the shade, appears pure 

 green. On the other hand, plants in the outside of the same plot 

 often shew a trace of pink in their stems also. 



Descendants, in the F, generation, of plants which were pcrk 



GREEN IN the F GENERATION. 



yeed from the following plants produced a majority of green 

 plants in the F, generation. The relative number of green and 

 red plants given in Tables III and V are reproduced in Table 



vin. 



