1897 ] BOTANICAL SOCIETY OF AMERICA 181 
Hurd Rusby, of the New York College of Pharmacy; Harry 
Luman Russell, of the University of Wisconsin; Joseph Newton 
Rose, of the United States National Museum; Walter Tennyson 
Swingle, of the Division of Physiology and Pathology, U. S. 
Department of Agriculture. 
The address of the retiring president was delivered on Tues- 
day evening by Professor Dr. Charles E. Bessey, on ‘‘The 
phylogeny and taxonomy of angiosperms.” It is printed in 
full elsewhere in this number. 
The following papers were read on Wednesday : 
B. L. Ropinson: A case of ecblastesis and axial prolification 
in Lepidium apetalum. 10 min, (Published in full in this 
number. ) 
J. C. Arrnur: Movement of protoplasm in cwnocytic hyphe. 
45 min. 
The movement was first see by the author in 1890, and 
has since been studied in eight species of Mucoracea. It 
resembles, but is not quite so rapid as the movement long 
known in the slime molds. The movement is best seen when 
the fungus is growing in a very moist atmosphere. The con- 
tents of the filament, including the large and numerous vacuoles, 
flow ina surging stream through the principal branches, more 
commonly toward the growing ends of the hyphe and the form- 
ing sporangia. But the movement is inconstant, and is often 
reversed, or brought to a standstill, without any regularity. 
The author believes that the movement is due to the osmotic 
absorption of water in one part and the extravasation of water 
in a distant part. When the filaments are turgid this change of 
water content displaces the whole liquid mass from the place of 
greater tension toward that of lesser tension, producing a more 
or less uniform movement. The living protoplasm is, however, 
credited with being the exciting and controlling agent. 
Joun M. Courter: Pollen grains and antipodal cells. 30 min 
Attention was called to the current views concerning the 
homologies of the pollen grain structures, and special objection 
