No. 374.] PLANT MORPHOLOGY AND PHYSIOLOGY. 109 
cells and tracheids to the growing point. That the water in the pith 
is a reserve supply is shown by examination of a piece of stem, which 
was still alive and sending out small green leaves and short shoots, 
although it had been cut and in a dry place for over sixteen months. 
In this stem the turgid disks of pith were contracted into parchment- 
like membranes or partitions. Conduction of water in the stem was 
accomplished without the assistance of root pressure and without the 
aid, to any appreciable extent, of the transpiration from the extremely 
small leafy crown. 
K. M. Wiecanp: Notes on the Embryology of Potamogeton. Potamo- 
geton pauciflorus was studied with regard to the origin and develop- 
ment of the embryo sac, fertilization, and the development of the 
embryo. The embryo sac was found to arise in the normal manner 
for monocotyledons, viz., from the subepidermal cell after the cutting 
off of a tapetal cell. The egg apparatus and antipodals were, how- 
ever, somewhat abnormal. Although the normal number of cells in 
each was present, they were formed irregularly. The polar nucleus 
and first and second synergides seem to have been cut off successively 
from the mother nucleus of the egg. The synergides disappear almost 
immediately. A similar irregularity was found in the antipodals; but 
the most interesting feature, perhaps, was the fact that the definitive 
nucleus cuts off a very large basal nucleus, as in Sagittaria, before 
endosperm formation proceeds in the upper portion of the sac. 
Dr. ADELINE SCHIVELY: Recent Experiments and Observations on 
fruit Production in Amphicarpea monoica. Her published observa- 
tions show that minute aerial cleistogamous flowers when buried 
produce one-seeded “nuts ” with soft fruit and seed coats, instead of 
the typical two to three-seeded pods with indurated walls. 
She now shows that when purple flowers are buried, in the bud 
state, while still attached to the plant, or at any period up to the time 
of fertilization, perfect underground “nuts” mature instead of three 
to four-seeded pods. Various conclusions were drawn as to the 
‘powerful action of environmental agents in determining the size, 
shape, and consistence of the seed, the induration of its coats, and 
the number of seeds that might be produced. 
Dr. MarrHa Buntinc: On the Formation of Cork Tissue in the 
Roots of the Rosacee. Starting with observations on Geum urbanum 
and Geum rivale made by Professor Macfarlane in 1890, where 
intercellular spaces were shown to exist between the cork cells, she 
