Pennsylvania for Sessions igoi-igoj. Ivii 



exhibited slides illustrative of these. The leading charac- 

 teristics of Calamites, Asterophyllitcs, Sigillaria, Lepido- 

 dcndron, Ulodcndron and Halonia were given. Amongst 

 Gymnosperms the grouij of the Cordaitacece showed affin- 

 ities with our present-day Ginkgo. In regard to coal, thin 

 coal fragments often showed cellular structure, while grad- 

 ual transitions could be traced from decaying plant remains 

 of the present day, through peat, hydraulic peat, lignitic 

 coal, bituminous coal and anthracite to the hardest and most 

 modified, viz., graphite. 



On behalf of Miss Marion Mackenzie, chairman of the 

 Phytophenological Committee, Miss Carter presented a 

 report on the progress of vegetation to the end of April, as 

 follows: The spring season of 1902 had proved an early 

 one owing to warm days that alternated with others that 

 brought rain. Thus while the rainfall in 1901 from Janu- 

 ary-April was — 1.42, that for 1902 was -\-2.62. The 

 flowering in general had started early and lasted long. The 

 skunk cabbage showed pollen on January 27, 1902, and on 

 February 18, 1901. The silver maple was in first flower 

 on March loth and beginning to leaf on April 12, 1902, 

 while the corresponding dates were March i6th and April 

 22, 1901. The white poplar (Popuhis alba) first bloomed 

 on March 23d and leafed on April 22d, while it first bloomed 

 on April 9th in 1901. After numerous details of interest 

 had been given, a discussion followed which was partici- 

 pated in by Drs. Conard, Macfarlane and Miller. 



Dr. H. S. Conard then gave an "Exhibition and Descrip- 

 tion of Plants from the University Garden." 



May 16. Dr. Miller, President, in the chair. Owing to 

 ill health Miss E. O. Abbot was compelled to resign the 

 office of Corresponding Secretary, and Dr. H. S. Conard 

 was unanimously elected to fill the office. 



Dr. Harshberger then spoke of two fungoid diseases of 

 the white cypress. The genus Gymnosporangium, he said, 

 occurred only on coniferous plants, and formed its alternating 



