76 ESTABLISHMENT OF VARIETIES IN COLEUS 



(19) The explanation suggested by the production of patterns in 

 colloids by the Liesegang precipitation phenomena, especially as applied 

 by Gebhardt to the markings of butterfly wings and by Ktister to the 

 development of many types of variegation in plants, seems to apply 

 to the production of color patterns in Coleus. On this view color changes 

 may be considered as due to the formation of different diffusion centers 

 for the development and concentration of pigments. 



(20) Bud variations in Coleus are (a) common; (b) give numerous 

 different types which may be vegetatively quite constant from the first 

 or can be made so by selection; (c) show development of certain 

 types more commonly than others; (d) produce reversions to parental 

 types; (e) give development of different degrees of variability among 

 sister clones; (/) exhibit spontaneous changes in the fundamental color 

 characters (metidentical) and in the cellular and tissue processes result- 

 ing in color patterns. 



(21) The results show that in Coleus asexual and sexual reproduction 

 are not fundamentally different in respect to the extent and range of 

 variation. 



A. B. STOUT, 



Director of the Laboratories. 



NEW YORK BOTANICAL GARDEN, 



New York City, February 10, 1915. 



