136 THE DIRECT INFLUENCE 



two-thirds of that diameter. A large number of 

 the ovaries were killed by this treatment, but 

 many matured. The percentage of germination 

 in the species has been found to be low, however, 

 and of the few hundreds of seeds sown, not more 

 than a fifth germinated, and a few were killed by 

 drought. Eighty individuals grew to make ma- 

 ture rosettes during 1908. Sixty of these pro- 

 gressed so far as to bloom during the season, and 

 of these, twenty offered such material departures 

 from the parental form as to be readily distin- 

 guishable by visitors who had not critically ex- 

 amined any member of the genus, or, indeed, had 

 but little knowledge of plants. These twenty 

 derivatives showed eight distinct types, one of 

 which was represented by five individuals, one by 

 four, two by three, one by two, and three by one. 

 One type resulted from treatments with iodine, 

 calcium, and zinc ; four types came from a treat- 

 ment of two reagents, two from iodine alone, and 

 two from calcium alone. The revolution of the 

 corolla segments, the absence of the stiff clump 

 of trichomes from the lower lip, increase in vis- 

 cidity, mottling of the flower, and adhesion of leaf 

 bases resulting in perfoliation, are some of the 

 distinguishing marks of the new forms. Of these 

 characters some are already displayed by other 

 members of the genus, while some of the progres- 

 sive and retrogressive changes seem to be taken 

 before any relative had moved in the same direc- 

 tion. 



