Pennsylvania for Sesston 1897-98. II3 
November 5. Professor Macfarlane called the meeting to 
order and announced that the Committee of the Society recom- 
mended that the general meetings be held on the first and third 
Friday of each month, and that the regular class meetings be 
held on the second and fourth Saturday of each month. This 
was agreed to. He then moved, and it was unanimously 
carried, that Mr. Walmsley occupy the chair. 
Dr. Schively, by request, repeated her paper on “ Seaweeds 
from New England.” 
Dr. Macfarlane then spoke on “‘ The Development of the 
Stems of Forest Trees.” 
Mr. Walmsley demonstrated the use of acetylene light for 
the exhibition of botanical slides on the lantern screen. 
A large exhibition of living plants was made from the 
gardens and greenhouses of Messrs. Henzey, Blanc, and Craig, 
including a flowering plant of Wepenthes Raffiesiana from the 
greenhouse of Mr. Henzey, and some new hybrid Cannas and 
Chrysanthemums from Mr. Blanc. An interesting orchid 
exhibit was made by Mr. Le Boutillier, and the meeting then 
adjourned. 
November 19. Mr. Le Boutillier occupied the chair, and 
called on Dr. J. W. Harshberger, who spoke on “ The Vege- 
tation of the Yellowstone Hot Springs.” After referring to 
the more typical flowering plants of the region, he specially 
emphasized the microscopic vegetation of the warm waters, 
instancing such genera as Beggiatoa, Leptothrix, Phormidium, 
Gloeocapsa, etc. 
Dr. H. C. Porter gave a review of Fischer’s investigations on 
the Cyanophyceae, and drew special attention to the unsatisfac- 
tory action of differential stains as an analytical method. 
Professor Macfarlane exhibited and described shortly asym- 
biotic mycorhizal fungus observed by him in the South 
American genus Ff/ilesia, belonging to the Liliaceae. A 
living specimen of Acacia spadicigera from the University 
Botanic Garden was also exhibitedand described by him. The 
enlarged spiny stipules were stated to be the home of ant 
