6 PROCEEDINGS OF THE 



no longer blown right tlirough ; the wind-pressure at this point 

 is taken as the niinimum required for the dispersal of the fruit. 

 In this way it has been found tliat the following mininuim winds 

 are necessary for the dispersal of the fruits of the species named 

 below : — 



Senecio vuJgaHs — 1"6 m.p,h. = a light air. 



Senecio vulgaris, var. radiatus erectus — 1"89 ni.p.h.=a light 



breeze. 

 Ursinia speciosa — 2*G to 2*94 ni.p.h. = a liglit to gentle breeze. 

 Taraxacum officinale — 1'5 ni.p.h. = a light air. 

 2\issiIaf/o Farfara — '62 to "65 ni.p.h. = less than a light air. 

 Cfiutaurea impei'ialis — 7'7 ni.p.h. = a moderate breeze. 

 Leontopodium alpinum — 4"78 m.p.h. = a gentle breeze. 



Dr. D. H. Scott, Dr. E. J. Salisbury, Dr. Helen Gwynue- 

 Vaughan, and Dr. A. P. Young engaged in a discussion, and 

 Mr. Small replied. 



Mr. T. A. Dymes, F.L.S., contributed " A Note on the Seed of 

 Iris Pseudacorns, Linn." 



Dr. D. H. Scott, Dr. A. B. Eendle, Prof. G. S. Boulger, 

 Miss M. C>rson, and Mr. J. Eamsbottom contributed further 

 remarks, and the author replied. 



December 14th, 1916. 



Sir David Prain, C.M.Gr., F.K.S., President, in tlie Chair. 



The Minutes of the General Meeting of the 30th November,. 

 1916, were read and confirmed. 



Mr. Devi Sarn Bakshi, Mr. Eobert Hugh Bunting, and 

 Mr. Henry Augustus Hammond Dunn were admitted Fellows. 



Mr. H. S. Hoi.DEN communicated and explained a paper by 

 Miss Isabel McClatchie, B.Sc, entitled " Observations on the 

 Eoot-System of Impatiens Roylei, Walp." 



The paper was discussed by Dr. Ethel N. Thomas, Mr. W. C. 

 Worsdell, Miss Carson, and Dr. C. E. Moss, Mr, Holdeu 

 replying. 



Dr. Ethel N. Thomas communicated a paper " On the Distri- 

 bution of Monoecious Plants, and the Occurrence of Hermaphrodite 

 Flowers in Myrica Gale, with Observations on Variations of 

 Sex," by Miss A. J. Davey, M.Sc, and Miss M. Gibsox, B.Sc, 

 which was explained by the authors. 



Myrica Gale, the Common Bog Myrtle, is described as being 

 typically dioecious, but mention has been made by several authors- 

 of the occasional occurrence of the monoecious condition. 



