Pennsylvania for Sessions iSgg-igoo. xix 



from the collections of Mr. Le Boutillier and the University 

 Botanic Garden. 



April 28. Dr. Miller in the chair. Mr. T. Chalkley Palmer 

 communicated " Observations on the Growth and Conjugation 

 of Closterium," in which he described the structure of the 

 mature plant, varieties of conjugation and the development of 

 the zygospore. 



Dr. S. C. Schmucker, chairman of the Phytophenological 

 Committee, distributed recording sheets to the members and 

 gave some recent dates for flowering. An interesting discus- 

 sion followed. 



The chairman read a letter from Mr. Schumo, in which a 

 graphic description was given of the vegetation and vegetable 

 products of Guatemala ; the luxuriant growth of mosses, 

 filmy ferns and palms was specially commented on. 



Exhibitions of plants in flower were made by Mrs. Mary 

 Williams and from the University Botanic Garden. 



May 12. Dr. Miller in the chair. Mr. Hugh E. Stone, 

 of Doylestown, then gave an instructive lecture on "The 

 Orchids of Chester County," in which he compared his finds 

 with those recorded by Dr. Darlington in the " Flora Cestrica." 

 The special thanks of the society were awarded the speaker. 



Dr. J. W. Harshberger then described "Aspects of Trop- 

 ical Nature in Mexico, with Special Reference to Native 

 Dahlias." He spoke of the more typical plants observed dur- 

 ing his stay there. He graphically pictured the varying 

 character of the vegetation by aid of lantern slides ; and then 

 compared the different species and varieties of dahlia as to 

 size, habit and color of the flowers. 



Professor Macfarlane gave short notes on a collection of 

 plants recently received at the University garden through the 

 kindness of Mrs. Mar>' Williams. These included flowering 

 specimens of the Coonti or Compti {Zaniia integrifolia), 

 Ficiis aiirea, Isonandra gutta, Hevea braziliensis, etc. 



