284 The Botanical Gazette. [September, 
FILIBERT ROTH: ‘‘Shrinkage'of wood as observed under 
the microscope :”—In the author's absence the paper was read 
by title. 
L. H. PAMMEL: ‘‘Pesiza sclerotiorum;” and ‘‘Tempera- 
lure and some of its relations to plant fife.” —In the author's 
absence these two papers were read by title. 
Byron D. HALSTED: ‘‘Pleospora of Tropa@olum majus.” 
A fungus of the Alternaria type was found upon the foliage 
of a garden nasturtium, associated with the perithecia of a 
Pleospora, Cultures upon slant agar tubes were made 0 
Alternaria spores and a pure growth of the black mould ob- 
tained, followed by the ascigerous form zz and not upon the 
surface of the agar. The perithecia were of many and 
strange shapes, not at all resembling those of the leaves ex- 
cept in the cellular structure of the wall and the size and 
shape of the spores. This was an unusual instance of the 
direct modifying effect of the surrounding media upon the 
size and form of the perithecia. The species is apparently 
new and may be called Pleospora Tropeoli. } 
Byron D. HaALsTED: ‘‘Secondary spores of anthracnosts. 
—A study of the germinating spores of species of anthracnose 
shows that the formation of ‘special cells” or ‘secondary 
spores” is probably confined to two genera, viz: Gloeospor 
ium and Colletotrichum. They seem to be constantly ae 
ent in these two genera. Those conditions which are 1° 
Byron D. Hatstep: ‘A bacterium of P. hascolus.’—" # 
Paper announces the discovery of a new bacterial gree” 
beans, the species ig characterized, and the name Bacte 
Phaseolum proposed. : feces 
THOMAS MEEHAN: « The significance of cleistogamy: 
In the author’s absence the paper was read by title. 
