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 amcri- 

 caiitim) 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 i. 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 oalvs 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 Qucrcus 

 Michauxii, 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 ij. Dr. Henry Leffmann occupied the chair. The 

 Recording Secretary announced that owing to the resigna- 



