142 . BOTANICAL GAZETTE [AUGUST 
Stenospermation functioning stamens replace the ovules in many 
of the carpellary chambers. This reminds one of a somewhat 
similar abnormality noted by CHAMBERLAIN in Salix, and of 
characteristics noted by Treus in Balanophora and Loranthus. 
7. In three species investigated with regard to number of 
chromosomes the homotypic number was found to be 16. 
8. Tetrad formation in the anthers of some species is by means 
_ of simultaneous, in others by successive, divisions. 
9. In Richardia the male nuclei are not surrounded by a definite 
cytoplasmic envelope, and the division producing them is often 
delayed until dehiscence or later. Sometimes the earlier divisions 
are similarly delayed. 
to. The bulb of Arisaema may bear staminate and pistillate 
blossoms in alternate years. 
Thanks are due to Mr. Frep J. Seaver, of the New York 
Botanical Gardens, for furnishing most of the material on which 
the foregoing observations were made. The author also wishes to 
express his deep obligation to Professor T. H. MAcBRIDE, of the 
State University of Iowa, for the suggestion which first led to the 
undertaking, and for advice and assistance freely rendered at every 
stage of the work. 
Cepar Rapips, Iowa 
pe aise is Saas ee 
