23 



Among other plants exhibited were the following, by Mr. J. W. 

 Addyman, B.A., collected at Bilton, near Knaresborough : — Vaccinium 

 myrtillus, Lysimacliia nemorwn, Asperula odorata, Ophioglossum vulgatum, 

 Equiselum sylcatieum, Stellaria graminea, Luzula maxima, Lychnis diurna, 

 Orobus tuberosus, Chrysosplenium oppositifolium, Cardamine amara, Carda- 

 mine ])fatensis, Arcnaria trinervia, Aj'uga reptans, and Sonicida europma. 



Meeting of the Club held at the Medical School, Park Street, June 

 17th, 1889. Professor De Burgh Birch, M.D., CM., F.E.S.E., President, 

 in the chair. 



DEMONSTRATIOX OF CILIARY MOVEMENT. 

 PROFESSOR BIRCH. 



A short lecture was given first on "The Structure and Function of Cilia." 

 The members then went into the Laboratory, where each was provided 

 with microscope and appliances necessary for the intended work. First 

 the gill of the Common Mussel was examined immediately on taking it 

 out of the shell, when the beautiful wave-like movement of the cilia, 

 carrying fluid along in a definite direction, was distinctly seen. The tissue 

 was then subjected to the fumes of ether, which produced a cessation of 

 movement, which was again recovered by means of heat brought to bear 

 upon the glass slip by a simple and effective contrivance. An interesting 

 demonstration of ciliary movement was shown upon the Common Frog, 

 which, when dead, the mouth being laid open, a piece of cork placed upon 

 the roof of the mouth could be distinctly seen to be carried down 

 the oesophagus. 



EXCURSION. 



An excursion was made on June 24th, 1889, to the nurseries of 

 Mr. Featherstone, of Kirkstall. The party was cordially welcomed by 

 Mr. Featherstone's son, who conducted them over the numerous houses. 

 Mr. Featherstone courteously answered the many questions which were 

 pressed upon him, and gave much interesting information respecting the 

 varied and beautiful exotic plants which were examined. Among these 

 claiming especial notice were Gloriosa superba, a lilaceous plant, with an 

 abnormal arrangement of the parts of the flower. Some fine specimens of 

 Marchantia polymorpha, showing antheridia and archegonia ; Eucharis 

 Candida, so named from its chalice-like centre ; the Tuberose {Polyanthes 

 tuberosa), with its sweet fragrance, which came in for a share of 

 admiration. The Palms, Cycads, Ferns, and Roses were very attractive, 

 and the variegated foliage of the Crotons, as well as the great variety of 

 Pelargoniums (among which was a pure white one), were very much 

 admired ; in fact, the entire collection deserves all the encomiums passed 

 upon it by the members, as also the warm and hearty thanks accorded 



