Pennsylvania for Session iSgj—gS. 113 



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 Nepenthes Rafflesiana 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 ig. 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, Leptotlirix, Phormidiiim, 

 Gloeocapsa, etc. 



Dr. H. C. Porter gave a review of Fischer's investigations on 

 the Cyanopliyceae, and drew special attention to the unsatisfac- 

 tory action of differential stains as an analytical method. 



Professor Macfarlane exhibited and described shortly a sym- 

 biotic mycorhizal fungus observed by him in the South 

 American genus Pliilcsia, belonging to the Liliaceae. A 

 living specimen of Acacia spadicigcra from the University 

 Botanic Garden was also exhibited and described by him. The 

 enlarged spiny stipules were stated to be the home of ant 



