Geology and Natural Mistory. 469 
restricted. 
The true anthesis, as is now shown, is nocturnal, the flowers 
remaining half closed during the day. The anthers, with com- 
paratively large and few grains of glutinous pollen, open rather 
earlier than the flower. The tips of the style, which were natu- 
rally taken for stigmas, are now shown to be functionless, the 
tube, which extends downward nearly to the f the ovary 
an communicates directly with them. $s soon as it 
became evident that fertilization must depend t octurnal 
the investigation. The t has been given to the 
scientific world in his interesting memoir on Pronu yuccasella, 
at the meeting of the American Association 
publi , as a sequel to Dr. Engelmann’s monograph, in the 
the Saponaria root. It is curious to learn that the 
negroes of the coast of South Carolina repeatedly destroyed Dr. 
Mellichamp’s carefully observed oe of Yuceas, in order to 
obtain the saponaceous rootstock.” In Colorado Territory we 
found that Yucca angustifolia is as generally called “ Soap-plant, 
as is the Chlorogalum in California. ; 
While the nature of the fruit, whether capsular or baceate, is a 
ili rally, Yueca has both kinds ; 
