2 Weiss, Coloiir of Flowers of a Tropceolum Hybrid. 



As it seemed likely that this Tropaeolum was of 

 hybrid nature, and that its flowers partook in varying 

 degree of the character of the two parents, it seenned to 

 be of interest to find out what would be the result of self- 

 fertilising the various flowers and examining the resultant 

 offspring. 



This was done with a number of flowers, both of the 

 red and yellow, and also of the intermediate forms. The 

 plants grown from these seeds showed an interesting 

 series of forms, indicating a segregation of parental 

 characters in this (probably the f2) generation, but it was 

 at once noticeable that the colour of the flower of the 

 previous (fi) generation did not determine the floral 

 colour of the offspring, yellow flowers yielding both 

 plants which bore red flowers and also others with yellow 

 flowers. 



A segregation of forms seemed to have taken place, 

 however, in this (f2) generation, both as to tallness and 

 as to colour. The parent plant, though purchased as 

 TropCBoluni minor, grew ultimately to fairly large size. 

 Of its offspring two were distinctly dwarf forms, while 

 eight were tall. Both the dwarf forms had red flowers, 

 one of them of a very dark shade, while of the tall forms 

 four were red and four were yellow, though these latter 

 were, as will be stated later, plants of two distinct types. 



It would appear from this segregation, as is indicated 

 by other experiments on Tropceolum, that in this genus 

 dwarfness is recessive to tallness, as is the case in Sweet 

 Peas. 



As regards the colour of the flowers of the ten plants 

 raised from the seeds of the original hybrid parent, as 

 indicated above, one of the dwarf forms had dark claret- 

 coloured flowers, which accounted probably for the brown 

 blotches in some of the later flowers of the hybrid parent. 



