RESEARCH SEMINAR. 253 



offers the only known means of thoroughly and quickly steril- 



izing a reservoir. 



Extensive experiments on a large scale are now being carried 

 on and results already obtained warrant the conclusion that the 

 method is satisfactory in every respect. 



July 75. Regeneration in Plants as Illustrated by Zamia 

 floridana. By MR. MINTIN A. CHRYSLER. 



Zamia floridana exhibits a remarkable capacity for producing 

 new shoots and roots from pieces of stem. A piece no larger 

 than a walnut can give rise to a new plant. The new shoots 

 proceed in most cases from the vascular region of the central 

 cylinder, but may arise from the neighborhood of the periderm, or 

 may form a cap over the whole central cylinder. Only the last 

 case merits the term " regeneration " ; the others are merely 

 instances of adventitious budding. Roots may spring from the 

 cut surface just as do the shoots. The power of producing new 

 shoots seems to be shared by all tissues which have remained 

 meristematic, or which have resumed the power of cell division 

 such as the phellogen of the wound cork. A case of budding 

 from the hypocotyl has been observed. The theories of " latent 

 buds" and "polarity" are not supported by the specimens of 

 Zamia examined. 



July 19. Morphological Studies on Sargassum Filipendula. 

 By Miss ETOILE B. SIMONS. 



The conceptacle, antheridium, oogonium, and cryptostoma 

 were discussed in detail. 



Sargassian Filipendula is unlike the accounts of authors who 

 have studied various other members of the Fucales in the develop- 

 ment of its conceptacle. 



Bower in his article " On the Development of the Conceptacle 

 in the Fucaceae " describes a single superficial initial cell, which 

 usually disintegrates. According to his account cells adjacent 

 to this initial divide and form the conceptacle. Holtz announces 

 a group of initial cells in Pelvctia fastigiata which disintegrate. 

 Below these and other disintegrating cells are found the elements 

 which form the conceptacle walls. 



