Pennsylvanta for Sessions 1901-1903. lvii 
exhibited slides illustrative of these. The leading charac- 
teristics of Calamites, Asterophyllites, Sigillaria, Lepido- 
dendron, Ulodendron and Halonia were given. Amongst 
Gymnosperms the group of the Cordattacee 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 toth and beginning to leaf on April 12, 1902, 
while the corresponding dates were March 16th and April 
22, 1901. The white poplar (Populus 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 onlyon coniferous plants,and formed its alternating 
