4 Weiss, Colour of Flowers of a Tropcsolum Hybrid. 



commenced at the margin of the petal, and extended in 

 successive flowers more and more towards the base. 



About the same time, second week of August, plant 

 K, which in other respects agreed with the above plant 

 (G), showed indications of a few parti-coloured flowers, 

 and a little later the flowers were completely red. As the 

 season progressed some of the flowers produced were 

 deeper coloured, almost claret, and in their later stages of 

 expansion practically brown. This change was not noted 

 in plant G, but its occurrence in K pointed to its retaining 

 more than any of the other plants the characters of the 

 original parental hybrid. 



Towards the end of August, when the wet weather 

 had again set in, the plant went back to its original 

 yellow flowers. 



Though the hybrid parent showed no marked periodi- 

 city in the bearing of differently coloured flowers, this was 

 apparent in those of its off"spring (G and K), which 

 inherited this variability, the red flowers coinciding with 

 the brightest and hottest weather. 



This peculiar feature is in agreement with the 

 Tropaolum hybrid described by Ga;rtner, which at the 

 commencement of the flowering season produced orange- 

 coloured flowers like those of its male parent (T. majiis), 

 while towards the close of the season, with decreasing 

 temperature, yellow flowers, like those of the maternal 

 parent (7". minus) were produced. In the experiments 

 described above the plants, however, commenced with 

 yellow flowers, proceeded during the very short hot 

 weather of the beginning of August to produce red 

 flowers, and theu went back to yellow. 



It would appear, therefore, that in the case of the 

 original hybrid and in two of its offspring we have not got 

 a segregation of parental characters in the flower buds 



