xl Proceedings of the Botanical Society of 
on ‘“Karyokinesis in Some Flowering Plants,” illustrated 
by micro-lantern demonstration. The spring dropper or 
offshoot of the dogs-tooth violet (Erythronium ament- 
canum) had proved an excellent object for study of division, 
as the cells were large and the chromosomes numerous. The 
first week of May proved to be the best time for securing 
material. The formation of the chromosomes of the spindle 
and of the daughter nuclei were traced and illustrated by 
preparations. 
Professor Macfarlane drew attention to thirty-four vol- 
umes recently added to the Botanical Library, and exhibited 
several interesting plants from the Botanic Garden. 
March t. Mr. W. H. Walmsley was called to the chair. 
Mr. J. Horace McFarland, of Harrisburg, described 
“Methods of Plant Photography for Botanical Illustration,” 
and exhibited a large set of lantern slides bearing on the sub- 
ject. The chairman congratulated Mr. McFarland, and 
secured information as to the time exposures, developer used 
and other photographic details. 
Miss Mackenzie distributed phyto-phenological sheets for 
the session, and gave directions as to the recording of obser- 
vations. Henry S. Conard exhibited and commented on 
specimens of two oaks gathered during the past summer. 
One of these showed affinities in leaf to the willow and black 
oak, though the only two oaks in immediate proximity were 
the willow and pin oak, and he considered the plant to be 
a probable hybrid between these two. The other specimen 
was found in Bucks County, and seemed to be Quercus 
Michauxti, a southern form. If his identification was cor- 
rect, the new locality would be the most northerly hitherto 
recorded. 
The director of the University Garden exhibited and com- 
mented on numerous parent and hybrid Cypripedium and 
other orchids. 
March 15. Dr. Henry Leffmann occupied the chair. The 
Recording Secretary announced that owing to the resigna- 
