Clarkia Pulcliclla. 147 



narrow red longitudinal line on it which was not nuich 

 broader than a flower stalk and extended over four inter- 

 nodes. The upper, lower, and middle flowers of the 

 tract stood on this line ; the two former were completely 

 red, the middle one only partly so. The two flowers oc- 

 cupying intermediate positions but on the green side of 

 the branch were almost white. 



The culture of 1899 was richer in sectorial plants 

 than that of 1898, as the isolation of the seed-parents 

 w^ould have led us to expect. From the mixed seeds 

 referred to above, I had about 300 plants of which five 

 were wdiolly red whilst the proportion of sectorial ones 

 was 40%. The single selected seed-parent, however, 

 gave rise to only 50 offspring which flowered, of which 

 one was red, whilst the proportion of sectorials mounted 

 to 70%. The average number of reds in the two cultures 

 was 1-2% ; and that of sectorial plants 45%. 



These experiments show that the pale flowered plants, 

 selected as seed-parents, give rise to a fairly constant 

 progeny amongst which the proportion of sectorial plants 

 is quite small. 



The progeny of sectorial plants, on the other hand, 

 consists of about 45% broadly striped and 1-2^^.4 red 

 plants, the remainder being pale tinged with red, or at 

 any rate very poor in strii)es. 



The cultures of the pale fl.owered plants are ordinarilv 

 in flower some weeks before the first stripes appear: but 

 in the beds of sectorial plants the red may be seen among 

 the very first flowers. Here also the white flowered ones 

 are always in a large majority ; among a thousand flowers 

 of this race I counted 34 striped and 8 sectorial ones, 

 that is to say only 4% altogether. 



