14 PEOCEEDINGS OF THE 



Mr. C. Baron Clarke, F.E.S., F.L.S., read a note on Eoot- 

 Pressure, in which he contested the views of Sachs and his 

 followers, that root-pressure is sufficient to sustain the weight o£ 

 a column of water of the height of 100 (or even 300) feet, and to 

 force out drops at particular points of the leaves. He main- 

 tained that it was a mathematical error to apply the equation 

 •p^gpz to the case of water in plants, but that in a collection of 

 cells and longitudinal tubes of varying size, all very small, the 

 only mechanical ideas that could be applied were those of capillary 

 attraction and motion. He also argued that in the uninjured 

 l)lant the fluid pressure in any cell was very small, and that the 

 pressure due to a column 300, or even 30, feet would utterly 

 shatter the cells. 



The following papers were read : — 



1. " On the Life-Histories of Glyciphagus domesticus and 

 G. spinipes^' By Albert D. Michael, F.L.8. 



2. " On the Ovicells of some Lichenoporae." By A. W. Waters, 

 F.L.S. 



May 2J:th, 1888. 



Centenary Anniversary Meeting. 



This day, being the day appointed by the Charter, the hundredth 

 Anniversary Meeting of the Society was held in the Library, the 

 President's chair being placed at the west end of the room. The 

 portrait of Linnaeus was flanked by tall palms, and the front of 

 the ofiicial bureau was decorated with a bank of flowers and 

 ornamental plants, the whole of these decorations having been 

 lent for the occasion by Htirry Veitch, Esq., F.L.S. 



The President announced the presentation to the Society by 

 Mr. Frederick Justen of 16 Volumes of Dictionaries of ancient 

 and modern languages and three Atlases, for which valuable 

 present a special vote of thanks to the donor was unanimously 

 accorded. 



H.M. Oscar II., King of Sweden and Norway, was unani- 

 mously elected by show of hands to be an Honorary Member of 

 the Society. 



The Treasurer presented the Annual Statement of Accounts 

 duly audited, as shown on p. 15, and made a few remarks on the 

 financial history of the Society from its foundation. 



(An abstract compiled by the senior Secretary is appended to 

 the President's Address, on \^. 42.) 



