XVIli Proceedings of the Botanical Soctety of 
galls. He spoke of gall makers, gall guests and gall parasites. 
He then described the life history and complicated growth 
forms shown by various gall makers and commented on some 
of the more common types of gall. 
Dr. Kraemer spoke on “ The Cellular Structure of Gall 
Growths.” He described observations made on native oak 
galls, and indicated the relation of these, in size and age, to cer- 
tain chemical substances present in their cells. 
Mr. J. R. Murlin, M. A., read a paper entitled “Studies on 
Aggregation in Sensitive Plants.” He compared results 
obtained in the Botanical Laboratory of the University with 
those of Darwin, Gardiner and others, and considered that 
aggregation was largely due to the formation of tannin com- 
pounds by the living protoplasm of each cell. 
Mr. Le Boutillier exhibited species of Phalenopsis in flower, 
and from the University garden were shown several species of 
Primula and miscellaneous flowering plants. 
April rg. Dr. Miller in the chair. Mr. Tricker, of River- 
ton, N. J., gave ‘‘ Observations on the Structure and Growth 
of Water Lilies and Other Aquatics.’ After dealing with the 
more important hardy and tender forms he described the ger- 
mination, mode of growth and methods of reproduction by 
tubers and seed. 
Mr. Francis Windle communicated ‘“ Notes on a Collection 
of Lichens lately made by Members of the Society at May’s 
Landing.’ In all seventeen growth forms were collected, so 
that the locality was a rich one in this type of vegetation. 
Specimens of twelve of these were then distributed to mem- 
bers at the close of the meeting. 
A rich collection of orchid blooms, including sixty-two 
species and hybrids, was exhibited from Mrs. George Wil- 
son’s conservatories by Mr. Pericat. The best thanks of the 
Society were accorded to Mrs. Wilson and Mr. Tricker. 
Additional exhibits and observations were made on plants 
